Mean Annual Number of Days with Snowfall 0.1", 1", .5", and 10"
Conterminous United States

Statistic: 30-year average number of days with snowfall >= 0.1", 1". 5", and 10 
Time period: 1961-1990
Time interval: annual
Spatial format: grid
Data format: ARC/Info ASCII GRID

 Projection: Geographic
Spatial resolution: 1.25 arc-minutes (~2 km)
Spatial Extent: Conterminous United States
Units: Days
Date created: August 2000
Methods: Statistical derivation from mean monthly and annual snowfall, derived from mean precipitation and mean wet-day temperature mapped with the PRISM modeling system, and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details. 

Examples 
 
Mean annual number of days with snowfall >= 0.1
Features
  • Reviewed and approved by the US National Climatic Data Center and regional experts
  • Incorporates topographic effects on snowfall 
  • Captures rain shadows in great detail 
  • Includes coastal and lake effects on snowfall 
  • Accounts for the varying ability of terrain features to enhance snowfall 
  • Consistent treatment and spatial quality control of station data 
  • Consistent coverage across all state boundaries 
  • "Universal" geographic (latitude/longitude) projection allows conversion to any other coordinate system 
  • Data format allows for easy import into ESRI's GIS products, as well as MAPINFO and Intergraph's GeoMedia 
Data used in analysis
  • 7,264 National Weather Service stations for number of days with snowfall >=0.1", 1". 5", and 10" 
  • 7,349 stations for mean snowfall
  • 9,110 stations for mean precipitation 
  • 6,358 stations for mean wet-day temperature
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