# North American Environmental Atlas - Monthly Precipitation, 1981-2010

TypeTIF

TagsNorth America, América del Norte, Amérique du Nord, Climate, Monthly, Precipitation, Mensual, Precipitación, Mensuelle, Précipitation, Canada, Canadá, United States, Estados Unidos, États-Unis, Mexico, México, Mexique, CEC, CCA, CCE

### Summary

    The Monthly Precipitation dataset consists of 12 raster files, one for each month, representing total precipitation values for the 1981–2010 reference period. These datasets are derived from a kilometer-scale climate product generated using the CHELSA downscaling model and represent long-term climatological means.

### Description

    The North American monthly precipitation layers were derived from the CHELSA Climatologies v2.1 dataset, which is based on statistically downscaled temperature and precipitation data at a spatial resolution of 30 arc-seconds (~1 km). CHELSA (Climatologies at High Resolution for the Earth’s Land Surface Areas) applies a statistical downscaling approach to atmospheric precipitation fields to produce high-resolution climate surfaces.For the North American Environmental Atlas, the continental subset was extracted from the global dataset and reprojected to the standard Lambert Azimuthal Equal Area projection used by the Atlas.Additional technical details on the downscaling methodology and derived climate predictors are provided in: Karger, D. N., Conrad, O., Böhner, J., Kawohl, T., Kreft, H., Soria-Auza, R. W., Zimmermann, N. E., Linder, H. P., & Kessler, M. (2017). Climatologies at high resolution for the Earth’s land surface areas. Scientific Data, 4, 170122. https://doi.org/10.1038/sdata.2017.122 Files Download

### Credits

    Commission for Environmental Cooperation (CEC). 2026. “North American Environmental Atlas - Monthly Precipitation, 1981-2010”. Swiss Federal Institute for Forest, Snow and Landscape Research (WSL). Ed. 2.0, Raster digital data [1-km].

### Use limitations

    None. Acknowledgment of the Commission for Environmental Cooperation and the (CHELSA) initiative at the Swiss Federal Research Institute WSL (Land Change Science group) would be appreciated in products derived from these data.

### Extent

West | -180 | East | -50
North | 85 | South | 14

### Scale Range

Maximum (zoomed in) | 1:5,000
Minimum (zoomed out) | 1:150,000,000

### Topics and Keywords ▼►

Themes or categories of the resourceAtmospheric Sciences, Environment, Geoscientific
Content type ⇔Downloadable Data
  Export to FGDC CSDGM XML format as Resource DescriptionNo
Theme keywordsNorth American Environmental Atlas > Climate > Climate, North American Environmental Atlas > Climate > Precipitation, North American Environmental Atlas > Climate > Monthly Precipitation
  Thesaurus ▼►
    TitleNorth American Environmental Atlas
    Publication date2026-03-20 00:00:00
    Responsible party - publisher
      Organization's nameCommission for Environmental Cooperation (CEC)
        Contact information ▼►
          Phone
            Voice+1 514 350 4300
            Fax+1 438 701 1434
          Address
            Typephysical
            Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
            CityMontreal
            Administrative areaQuebec
            Postal codeH3B 4L4
            CountryCA
            e-mail address info@cec.org
          Online resource
            Online location (URL) https://www.cec.org/north-american-environmental-atlas/
Place keywordsMid-latitude, Western Hemisphere, Northern Hemisphere, North America, Canada, Mexico, United States
  Thesaurus ▼►
    TitleNorth American Environmental Atlas
    Publication date2026-03-20 00:00:00
    Responsible party - publisher
      Organization's nameCommission for Environmental Cooperation (CEC)
        Contact information ▼►
          Phone
            Voice+1 514 350 4300
            Fax+1 438 701 1434
          Address
            Typephysical
            Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
            CityMontreal
            Administrative areaQuebec
            Postal codeH3B 4L4
            CountryCA
            e-mail address info@cec.org
          Online resource
            Online location (URL) https://www.cec.org/north-american-environmental-atlas/
Temporal keywords1981; 2010

### Citation ▼►

TitleNorth American Environmental Atlas - Monthly Precipitation, 1981-2010
Publication date2026-03-20 00:00:00
Edition2.0
Presentation formats ⇔digital map
FGDC geospatial presentation formatraster digital data
Resource identifier
  ValueNAatlas_5.03

### Citation Contacts ▼►

Responsible party - point of contact
  Individual's nameDominique Croteau
  Organization's nameCommission for Environmental Cooperation (CEC)
  Contact's positionProject Lead, Geospatial and Environmental Information
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
Responsible party - resource provider
  Organization's nameSwiss Federal Institute for Forest, Snow and Landscape Research (WSL)
    Contact information ▼►
      Phone
        Voice+41 44 739 2533
      Address
        Typephysical
        Delivery pointZürcherstrasse 111
        CityBirmensdorf
        Administrative areaZürich
        Postal code8903
        CountryCH
        e-mail address dirk.karger@wsl.ch
      Online resource
        Online location (URL) https://www.chelsa-climate.org/datasets/chelsa_climatologies
      Contact instructions

            Contact Person: Dirk Nikolaus Karger

Responsible party - resource provider
  Organization's nameCommission for Environmental Cooperation (CEC)
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
      Online resource
        Online location (URL) https://www.cec.org/north-american-environmental-atlas/
Responsible party - processor
  Individual's nameRicardo Llamas
  Organization's nameCommission for Environmental Cooperation (CEC)
  Contact's positionGeospatial Consultant
    Contact information ▼►
      Address
        Typepostal
        CityTlalnepantla
        Administrative areaState of Mexico
        Postal code54180
        CountryMX
        e-mail address rllamas.geo.analyst@gmail.com
Responsible party - publisher
  Organization's nameCommission for Environmental Cooperation (CEC)
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
      Online resource
        Online location (URL) https://www.cec.org/north-american-environmental-atlas/

### Locales ▼►

LocaleEnglish (UNITED STATES)
  TitlePrecipitation (1981-2010) – Monthly
LocaleSpanish; Castilian (MEXICO)
  TitlePrecipitación (1981-2010) – Mensual
LocaleFrench (CANADA)
  TitlePrécipitations (1981-2010) – Mensuelles

### Resource Details ▼►

Dataset languages ⇔English (UNITED STATES)
Dataset character setutf8 - 8 bit UCS Transfer Format
Statuscompleted
Spatial representation type ⇔grid
Spatial resolution
  Dataset's scale
    Scale denominator1000
  Ground sample distance
    Precision of spatial datam (meter)
Supplemental information

      The Commission for Environmental Cooperation (CEC) is an international organization created by Canada, Mexico, and the United States of America under the North American Agreement on Environmental Cooperation (NAAEC), which came into force at the same time as the North American Free Trade Agreement (NAFTA). The CEC was established to address regional environmental concerns, help prevent potential trade and environmental conflicts, and to promote the effective enforcement of environmental law. As of 2020, the CEC operates in accordance with the Environmental Cooperation Agreement, which entered into force at the same time as the CUSMA/T-MEC/USMCA trade agreement.

      Additional information on the CHELSA Climatologies v2.1 dataset used to produce the CEC North American climatological map layers is available in: Karger, D. N., Conrad, O., Böhner, J., Kawohl, T., Kreft, H., Soria-Auza, R. W., Zimmermann, N. E., Linder, H. P., & Kessler, M. (2017). Climatologies at high resolution for the Earth’s land surface areas. Scientific Data, 4, 170122. https://doi.org/10.1038/sdata.2017.122

      This data set is available in several formats, including TIF, Map package, and a PDF Map, along with other files appropriate to particular formats, such as .lyrx and .qlr files.

Processing environment ⇔Microsoft Windows 10 Version 10.0 (Build 26200) ; Esri ArcGIS 13.6.0.59527 -- ArcGIS Pro 3.6.1
Credits

      Commission for Environmental Cooperation (CEC). 2026. “North American Environmental Atlas - Monthly Precipitation, 1981-2010”. Swiss Federal Institute for Forest, Snow and Landscape Research (WSL). Ed. 2.0, Raster digital data [1-km].

ArcGIS item properties
  Name ⇔na_1981_2010_monthly_precip_01_jan.tif
  Location ⇔file://C:\Users\geodi\Dropbox\CEC\01_CEC_Env_Atlas_Base\5_climate\5_03_precipitationmonthly_1981_2010\02_Deliverables\PrecipitationMonthly_TIF\NA_PrecipitationMonthly\data\01_January\na_1981_2010_monthly_precip_01_jan.tif
    Access protocol ⇔Local Area Network

### Extents ▼►

Extent
  Description

        North America

  Geographic extent
    Bounding rectangle
      Extent type
      Extent used for searching
      West longitude-180
      East longitude-50
      North latitude85
      South latitude14
      Extent contains the resource ⇔Yes
Extent in the item's coordinate system
  westBL ⇔-6420114.545301
  eastBL ⇔3745885.454699
  southBL ⇔-3311929.920805
  northBL ⇔4268070.079195
  exTypeCode ⇔Yes

### Resource Points of Contact ▼►

Point of contact - point of contact
  Individual's nameDominique Croteau
  Organization's nameCommission for Environmental Cooperation (CEC)
  Contact's positionProject Lead, Geospatial and Environmental Information
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
Point of contact - publisher
  Organization's nameCommission for Environmental Cooperation (CEC)
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
      Online resource
        Online location (URL) https://www.cec.org/north-american-environmental-atlas/

### Resource Maintenance ▼►

Resource maintenance
  Update frequencyirregular
  Maintenance contact - publisher
    Organization's nameCommission for Environmental Cooperation (CEC)
      Contact information ▼►
        Phone
          Voice+1 514 350 4300
          Fax+1 438 701 1434
        Address
          Typephysical
          Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
          CityMontreal
          Administrative areaQuebec
          Postal codeH3B 4L4
          CountryCA
          e-mail address info@cec.org
        Online resource
          Online location (URL) https://www.cec.org/north-american-environmental-atlas/

### Resource Constraints ▼►

Constraints
  Limitations of use

        None. Acknowledgment of the Commission for Environmental Cooperation and the (CHELSA) initiative at the Swiss Federal Research Institute WSL (Land Change Science group) would be appreciated in products derived from these data.

Legal constraints
  Limitations of use

        This material is licensed under CC BY 4.0, allowing non-exclusive rights to distribute, remix, adapt, and build upon the material in any medium or format, including for commercial purposes, so long as attribution is given to the creator.

### Spatial Reference ▼►

ArcGIS coordinate system
  Type ⇔Projected
  Geographic coordinate reference ⇔GCS_Sphere_ARC_INFO
  Projection ⇔Sphere_ARC_INFO_Lambert_Azimuthal_Equal_Area
  Coordinate reference details ⇔
    ProjectedCoordinateSystem
      XOrigin-12742100
      YOrigin-12742100
      XYScale353442495.92849648
      ZOrigin-100000
      ZScale10000
      MOrigin-100000
      MScale10000
      XYTolerance0.001
      ZTolerance0.001
      MTolerance0.001
      HighPrecisiontrue
      WKTPROJCS["Sphere_ARC_INFO_Lambert_Azimuthal_Equal_Area",GEOGCS["GCS_Sphere_ARC_INFO",DATUM["D_Sphere_ARC_INFO",SPHEROID["Sphere_ARC_INFO",6370997.0,0.0]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Lambert_Azimuthal_Equal_Area"],PARAMETER["false_easting",0.0],PARAMETER["false_northing",0.0],PARAMETER["central_meridian",-100.0],PARAMETER["latitude_of_origin",45.0],UNIT["Meter",1.0]]
Reference system identifier
  Value37008
  CodespaceWKID

### Spatial Data Properties ▼►

Georectified Grid ▼►
  Number of dimensions ⇔2
  Axis dimensions properties - column (x-axis)
    Dimension size ⇔10166
    Resolution ⇔
        1000.000000 m (meter)
  Axis dimensions properties - row (y-axis)
    Dimension size ⇔7580
    Resolution ⇔
        1000.000000 m (meter)
  Cell geometry ⇔area
  Point in pixel ⇔center
  Transformation parameters are available ⇔Yes
  Check points are available ⇔No
  Corner points
    Point ⇔-6420114.545301 -3311929.920805
    Point ⇔-6420114.545301 4268070.079195
    Point ⇔3745885.454699 4268070.079195
    Point ⇔3745885.454699 -3311929.920805
  Center point ⇔-1337114.545301 478070.079195
ArcGIS Raster Properties ▼►
  General Information
    Pixel depth ⇔16
    Compression type ⇔LZW
    Number of bands ⇔1
    Raster format ⇔TIFF
    Source type ⇔continuous
    Pixel type ⇔unsigned integer
    No data value ⇔0
    Has colormap ⇔No
    Has pyramids ⇔Yes

### Spatial Data Content ▼►

Image Description
  Type of informationphysical measurement
  Attribute described by cell valuesTotal Monthly Precipitation
  Band information
    Description ⇔Band_1
    Maximum value ⇔1552
    Minimum value ⇔1
    Units
      Symbol[mil_i]
    Number of bits per value ⇔16
  Triangulation has been performedNo
  Radiometric calibration is availableNo
  Camera calibration is availableNo
  Film distortion information is availableNo
  Lens distortion information is availableNo

### Data Quality ▼►

Scope of quality information ▼►
  Resource leveldataset
Data quality report - Completeness omission ▼►
  Data quality measure reference
    Measure description

          A spatial completeness assessment was conducted after extracting the North American extent and reprojecting the CHELSA Climatologies v2.1 monthly precipitation (pr) raster layers to the standard Lambert Azimuthal Equal Area projection used by the Atlas. The dataset was inspected for NoData values, edge artifacts, and potential cell misalignment introduced during reprojection. Cell counts and value ranges were verified to ensure that no unintended data loss or omissions occurred. The final raster exhibits continuous coverage across the defined terrestrial extent, with NoData values restricted to areas outside the land mask.

  Conformance test results
    Test passedYes
    Product specification ▼►
      TitleNorth American Environmental Atlas - Monthly Precipitation, 1981-2010
Data quality report - Topological consistency ▼►
  Data quality measure reference
    Measure description

          The raster maintains consistent cell size, alignment, and spatial continuity following clipping and reprojection. No unintended gaps, overlaps, or resampling artifacts were introduced during processing.

  Conformance test results
    Test passedYes
    Product specification ▼►
      TitleNorth American Environmental Atlas - Monthly Precipitation, 1981-2010

### Lineage ▼►

Lineage statement

      The North American monthly precipitation layers were derived from the CHELSA Climatologies v2.1 dataset, which is based on statistically downscaled temperature and precipitation data at a spatial resolution of 30 arc-seconds (~1 km). CHELSA (Climatologies at High Resolution for the Earth’s Land Surface Areas) applies a statistical downscaling approach to atmospheric precipitation fields to produce high-resolution climate surfaces.

      For the North American Environmental Atlas, the continental subset was extracted from the global dataset and reprojected to the standard Lambert Azimuthal Equal Area projection used by the Atlas.

      Additional technical details on the downscaling methodology and derived climate predictors are provided in: Karger, D. N., Conrad, O., Böhner, J., Kawohl, T., Kreft, H., Soria-Auza, R. W., Zimmermann, N. E., Linder, H. P., & Kessler, M. (2017). Climatologies at high resolution for the Earth’s land surface areas. Scientific Data, 4, 170122. https://doi.org/10.1038/sdata.2017.122

Process step ▼►
  When the process occurred2026-02-18 00:00:00
  Description

        Each CHELSA Climatologies v2.1 monthly precipitation (pr) raster layer for the 1981–2010 reference period was clipped to the North American region using the CEC North American Political Boundaries vector dataset. The clipping process was performed using the Extract by Mask tool in ArcGIS Pro. During this process, the raster was reprojected to the Lambert Azimuthal Equal Area projection, the standard coordinate reference system used by the CEC North American Environmental Atlas. The data were resampled from the original ~30 arc-second (~1 km) spatial resolution to a 1 km cell size and aligned with Version 1.0 of the CEC North American Total Annual Precipitation raster layer to ensure consistency in grid structure, spatial resolution, and cell alignment.

  Process contact - processor
    Individual's nameRicardo Llamas
    Organization's nameCommission for Environmental Cooperation (CEC)
    Contact's positionGeospatial Consultant
      Contact information ▼►
        Address
          Typepostal
          CityTlalnepantla
          Administrative areaState of Mexico
          Postal code54180
          CountryMX
          e-mail address rllamas.geo.analyst@gmail.com
  Source data ▼►
    Relationship to the process stepused
    Source citation ▼►
      TitleCHELSA-PrecipMonthly
  Source data ▼►
    Relationship to the process stepused
    Source citation ▼►
      TitleNA Political Boundaries
  Source data ▼►
    Relationship to the process stepused
    Source citation ▼►
      TitleNA CEC Annual Precipitation v1.0
  Source data ▼►
    Relationship to the process stepproduced
    Source citation ▼►
      TitleNA CEC Monthly Precipitation v2.0 temp
Process step ▼►
  When the process occurred2026-02-18 00:00:00
  Description

        In each monthly raster layer, pixel values were rescaled using the scale factor specified in the CHELSA Climatologies technical documentation. The transformation was performed by multiplying the raster values by 0.1 (scale factor), resulting in final values expressed in millimeters (mm). This conversion was implemented using the Raster Calculator tool in ArcGIS Pro.

  Process contact - processor
    Individual's nameRicardo Llamas
    Organization's nameCommission for Environmental Cooperation (CEC)
    Contact's positionGeospatial Consultant
      Contact information ▼►
        Address
          Typepostal
          CityTlalnepantla
          Administrative areaState of Mexico
          Postal code54180
          CountryMX
          e-mail address rllamas.geo.analyst@gmail.com
  Source data ▼►
    Relationship to the process stepused
    Source citation ▼►
      TitleNA CEC Monthly Precipitation v2.0 temp
  Source data ▼►
    Relationship to the process stepproduced
    Source citation ▼►
      TitleNA CEC Monthly Precipitation v2.0 temp
Process step ▼►
  When the process occurred2026-02-18 00:00:00
  Description

        The final monthly raster layers were exported in GeoTIFF format using a 16-bit unsigned pixel type. The conversion from the previous 32-bit floating-point format to 16-bit unsigned integer format rounded the values to whole numbers, ensuring that precipitation values are stored as integers in millimeters.

  Process contact - processor
    Individual's nameRicardo Llamas
    Organization's nameCommission for Environmental Cooperation (CEC)
    Contact's positionGeospatial Consultant
      Contact information ▼►
        Address
          Typepostal
          CityTlalnepantla
          Administrative areaState of Mexico
          Postal code54180
          CountryMX
          e-mail address rllamas.geo.analyst@gmail.com
  Source data ▼►
    Relationship to the process stepused
    Source citation ▼►
      TitleNA CEC Monthly Precipitation v2.0 temp
  Source data ▼►
    Relationship to the process stepproduced
    Source citation ▼►
      TitleNA CEC Monthly Precipitation v2.0
Source data ▼►
  Description

        CHELSA-climatologies is a global, kilometer-scale climate dataset generated with the CHELSA downscaling model. It consists of long term climatological means.

  Source medium nameonline link
  Source citation ▼►
    TitleCHELSA Climatologies v2.1 monthly precipitation raster layers (pr) representing accumulated water in all its phases.
    Publication date2026-01-07 00:00:00
    FGDC geospatial presentation formatraster digital data
    Resource identifier
      ValueCHELSA-PrecipMonthly
    Other citation details

          ~30 arcsecond resolution

    Responsible party - originator
      Organization's nameSwiss Federal Institute for Forest, Snow and Landscape Research (WSL)
        Contact information ▼►
          Phone
            Voice+41 44 739 2533
          Address
            Typephysical
            Delivery pointZürcherstrasse 111
            CityBirmensdorf
            Administrative areaZürich
            Postal code8903
            CountryCH
            e-mail address dirk.karger@wsl.ch
          Online resource
            Online location (URL) https://www.chelsa-climate.org/datasets/chelsa_climatologies
          Contact instructions

                Contact Person: Dirk Nikolaus Karger

    Resource location online
      Online location (URL) https://www.envidat.ch/#/metadata/chelsa-climatologies
Source data ▼►
  Description

        The Political Boundaries dataset of the North American Environmental Atlas represents political entities in North America as polygons.

  Source medium nameonline link
  Resolution of the source data
    Scale denominator10000000
  Source citation ▼►
    TitleNorth American Environmental Atlas - Political Boundaries
    Publication date2022-10-26 00:00:00
    FGDC geospatial presentation formatvector digital data
    Resource identifier
      ValueNA Political Boundaries
    Responsible party - originator
      Organization's nameCommission for Environmental Cooperation (CEC)
        Contact information ▼►
          Phone
            Voice+1 514 350 4300
            Fax+1 438 701 1434
          Address
            Typephysical
            Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
            CityMontreal
            Administrative areaQuebec
            Postal codeH3B 4L4
            CountryCA
            e-mail address info@cec.org
          Online resource
            Online location (URL) https://www.cec.org/north-american-environmental-atlas/
    Resource location online
      Online location (URL) https://www.cec.org/north-american-environmental-atlas/political-boundaries-2021/
Source data ▼►
  Description

        The Precipitation dataset is a raster file representing total annual precipitation values. The source data cover the period 1950–2000; however, individual weather stations used to generate the source dataset may not have complete records for all years within this time span.

  Source medium nameonline link
  Source citation ▼►
    TitleNorth American Environmental Atlas - Total Annual Precipitation, 1950-2000
    Publication date2011-04-01 00:00:00
    FGDC geospatial presentation formatraster digital data
    Resource identifier
      ValueNA CEC Annual Precipitation v1.0
    Other citation details

          1000 meters resolution

    Responsible party - originator
      Organization's nameCommission for Environmental Cooperation (CEC)
        Contact information ▼►
          Phone
            Voice+1 514 350 4300
            Fax+1 438 701 1434
          Address
            Typephysical
            Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
            CityMontreal
            Administrative areaQuebec
            Postal codeH3B 4L4
            CountryCA
            e-mail address info@cec.org
          Online resource
            Online location (URL) https://www.cec.org/north-american-environmental-atlas/
    Resource location online
      Online location (URL) https://www.cec.org/north-american-environmental-atlas/precipitation-1950-2000-annual/

### Distribution ▼►

Distributor ▼►
  Contact information - distributor
    Organization's nameCommission for Environmental Cooperation (CEC)
      Contact information ▼►
        Phone
          Voice+1 514 350 4300
          Fax+1 438 701 1434
        Address
          Typephysical
          Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
          CityMontreal
          Administrative areaQuebec
          Postal codeH3B 4L4
          CountryCA
          e-mail address info@cec.org
        Online resource
          Online location (URL) https://www.cec.org/north-american-environmental-atlas/
Distribution format
  NameTIF
  SpecificationAlthough these data have been processed successfully on computer systems at the Commission for Environmental Cooperation, no warranty expressed or implied is made regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by these agencies in the use of this data.
Transfer options
  Units of distributionMB
  Transfer size188

### Fields ▼►

Details for object na_1981_2010_monthly_precip_01_jan.tif.vat ▼►
  Type ⇔Table
  Row count ⇔1162
  Field OID ▼►
    Alias ⇔OID
    Data type ⇔OID
    Width ⇔4
    Precision ⇔0
    Scale ⇔0
    Field description ⇔

          Internal feature number.

    Description source ⇔

          Esri

    Description of values ⇔

          Sequential unique whole numbers that are automatically generated.

  Field Value ▼►
    Alias ⇔Value
    Data type ⇔Integer
    Width ⇔10
    Precision ⇔10
    Scale ⇔0
  Field Count ▼►
    Alias ⇔Count
    Data type ⇔Double
    Width ⇔19
    Precision ⇔0
    Scale ⇔0

### Metadata Details ▼►

Metadata language ⇔English (UNITED STATES)
Metadata character setutf8 - 8 bit UCS Transfer Format
Metadata identifierNAatlas_5.03_metadata
Scope of the data described by the metadata ⇔dataset
Scope name ⇔dataset
Last update2026-03-20
ArcGIS metadata properties
  Metadata formatArcGIS 1.0
  Standard or profile used to edit metadataISO19115_3
  Created in ArcGIS for the item2026-02-27 14:38:17
  Last modified in ArcGIS for the item2026-03-06 12:12:14
  Automatic updates
    Have been performedYes
    Last update2026-02-27 21:44:40

### Metadata Contacts ▼►

Metadata contact - point of contact
  Individual's nameDominique Croteau
  Organization's nameCommission for Environmental Cooperation (CEC)
  Contact's positionProject Lead, Geospatial and Environmental Information
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
Metadata contact - publisher
  Organization's nameCommission for Environmental Cooperation (CEC)
    Contact information ▼►
      Phone
        Voice+1 514 350 4300
        Fax+1 438 701 1434
      Address
        Typephysical
        Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
        CityMontreal
        Administrative areaQuebec
        Postal codeH3B 4L4
        CountryCA
        e-mail address info@cec.org
      Online resource
        Online location (URL) https://www.cec.org/north-american-environmental-atlas/

### Metadata Maintenance ▼►

Maintenance
  Update frequencyirregular
  Maintenance contact - publisher
    Organization's nameCommission for Environmental Cooperation (CEC)
      Contact information ▼►
        Phone
          Voice+1 514 350 4300
          Fax+1 438 701 1434
        Address
          Typephysical
          Delivery point1001 Robert-Bourassa Boulevard, Suite 1620
          CityMontreal
          Administrative areaQuebec
          Postal codeH3B 4L4
          CountryCA
          e-mail address info@cec.org
        Online resource
          Online location (URL) https://www.cec.org/north-american-environmental-atlas/

### Metadata Constraints ▼►

Constraints
  Limitations of use

        None. Acknowledgment of the Commission for Environmental Cooperation and the (CHELSA) initiative at the Swiss Federal Research Institute WSL (Land Change Science group) would be appreciated in products derived from these data.

Legal constraints
  Limitations of use

        This material is licensed under CC BY 4.0, allowing non-exclusive rights to distribute, remix, adapt, and build upon the material in any medium or format, including for commercial purposes, so long as attribution is given to the creator.