Mean Monthly and Annual Snowfall Conterminous United States |
Statistic: 30-year average snowfall (depth of freshly fallen snow) Time period: 1961-1990 Time interval: monthly Spatial format: grid Data format: ARC/Info ASCII GRID |
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Projection: Geographic Spatial resolution: 1.25 arc-minutes (~2 km) Spatial Extent: Conterminous United States Units: Millimeters Date created: August 2000 |
Methods: Statistical derivation from mean monthly and annual precipitation and wet-day temperature, mapped with the PRISM modeling system and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details. Examples |
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Mean annual snowfall |
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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
- 7,349 National Weather Service stations for snowfall
- 9,110 stations for mean precipitation
- 6,358 stations for mean wet-day temperature
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