110-Year Monthly Temperature and Precipitation Time Series
Conterminous United States

Statistic: Individual monthly and annual total precipitation and mean minimum and maximum temperature 
Time period: 1895-2004
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: Millimeters (precip) and Celsius (temperature)
Date created: Ongoing
Methods: The PRISM modeling system and Gaussian filter resolution enhancement.
See FGDC-compliant metadata

Example 
 
Mean monthly maximum temperature, July 2003
Features
  • Incorporates topographic effects on temperature and precipitation 
  • Captures rain shadows in great detail 
  • Includes coastal and lake effects  
  • Accounts for the varying ability of terrain features to enhance precipitation 
  • 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

  • 10,000+ Stations (Total varies with year and month) 
  • Stations include National Weather Service stations, USDA Natural Resources Conservation Service SnoTel stations, and hundreds of supplementary stations, including RAWS and various mesonets
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