Mean Monthly and Annual Precipitation
Alaska

Statistic: 30-year average total precipitation 
Time period: 1961-1990
Time interval: monthly
Spatial format: grid
Data format: ARC/Info ASCII GRID

 Projection: Albers Equal Area
Spatial resolution: 2 kilometers
Spatial Extent: Alaska
Units: Millimeters
Date created: November 2002
Methods: The PRISM modeling system and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details.

Examples 
Mean annual precipitation, entire region
Mean annual precipitation, Katmai Area
Features
  • Accepted by the US Department of Agriculture as the official precipitation maps for Alaska
  • Peer reviewed by experts statewide
  • Incorporates topographic effects on precipitation
  • Captures rain shadows in great detail
  • Includes coastal and lake effects on precipitation
  • Accounts for the varying ability of terrain features to enhance precipitation
  • Consistent treatment and spatial quality control of station data
  • Data format allows for easy import into ESRI's GIS products, as well as MAPINFO and Intergraph's GeoMedia

Data used in analysis

  • 544 Stations
  • 283 National Weather Service stations
  • 44 USDA Natural Resources Conservation Service SnoTel stations
  • 128 Supplementary stations, including national forest gauges, snow courses, and remote storage gauges
  • 89 Canadian stations
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