Mean Monthly and Annual Maximum, Minimum, and Mean Temperature
Conterminous United States

Statistic: 30-year average daily minimum, maximum, and mean temperature 
Time period: 1961-1990
Time interval: monthly
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: Tenths of degrees Celsius
Date created: August 2000
Methods: The PRISM modeling system and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details: maximum, minimum, mean. 

Examples 
Mean daily minimum temperature,
January, United States
Mean daily maximum temperature,
July, central California
Features
  • Reviewed and approved by the USDA NRCS and the US National Climatic Data Center 
  • Incorporates topographic effects on temperature 
  • Includes coastal and lake effects on temperature 
  • Accounts for temperature inversions on coasts and in inland valleys 
  • Uses upper-air temperature data to capture high-elevation patterns 
  • 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

  • 6,420 Stations 
  • 5,500 National Weather Service stations 
  • 370 USDA Natural Resources Conservation Service SnoTel stations 
  • 280 USFS/BLM Remote Automatic Weather Stations 
  • 70 Upper-air "stations" from the Gridded Global Upper-Air Statistics dataset 
  • 200 Canadian stations
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