Median, and Extreme Date of last 32F Temperature Conterminous United States
Statistic: 30-year median/extreme date of last 32F temperature in Spring  Time period: 1971-2000 Time interval: annual Spatial format: grid Data format: ARC/Info ASCII GRID	Projection: Geographic Spatial resolution: 15 arc-seconds (~400 m) Spatial Extent: Conterminous United States Units: Julian days Date created: September 2010
Methods: Mapped with the PRISM modeling system, with guidance from PRISM 1971-2000 mean minimum temperature grids, and Gaussian filter resolution enhancement. See FGDC-compliant metadata for details. Examples
Mean date of first 32F temperature in Autumn
Features 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 5,800 National Weather Service COOP and NRCS SNOTEL stations for date of last 32F in Autumn 5,946 stations for 1971-2000 mean monthly minimum temperature
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