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activity : 134d344e-indicator-frost-free-season-process
Satellite microwave sensors are used to determine the predominant frozen or thawed status of water on the land surface at a given time. Spatial measurements are taken over the contiguous United States and Alaska and include all vegetated land areas where seasonal frozen temperatures are a major constraint to growth. Non-frozen season data are converted to degrees F and aggregated. Anomalies are shown relative to the 1979-2010 average. The data used are from January 1, 1979 to December 31, 2010. Data was accessed on September 17, 2014.
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