Mean Monthly and Annual Average Dew Point Temperature
Conterminous United States

Statistic: 30-year average daily mean dew point temperature
Time period: 1961-1990 
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 applied to dew point depression (the difference between the minimum ambient temperature and the dew point temperature), and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details. 

Examples 
Mean daily average dew point temperature, October, entire region
Mean daily average dew point temperature,
October, northeastern US
Features
  • Reviewed and approved by the US National Climatic Data Center 
  • Incorporates topographic effects on ambient and dew point temperature 
  • Includes coastal and lake effects on ambient and dew point temperature
  • Accounts for inversions on coasts and in inland valleys
  • 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

  • Over 560 Stations 
  • 500 National Weather Service stations 
  • 41 USFS/BLM Remote Automatic Weather Stations 
  • 20 Canadian stations
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