![]() ![]() It provides an unbroken record of snow cover extending back well before the start of the continuous polar-orbiting satellite record (in 1978). This interactive map is derived from visual analysis of early satellite data combined with more recent satellite observations. Snow cover is measured in duration, meaning how many days a particular place was covered by snow, and whether the number of snow-covered days was above or below the long-term average for the period of 1966 to 2015. A different map display is available for every month of every year in the time series. ![]() How long does snow cover last each year and has that behavior been changing? This interactive map shows monthly snow cover anomalies for the Northern Hemisphere. Exchange for Observations and Local Knowledge of the Arctic (ELOKA).NASA National Snow and Ice Data Center Distributed Active Archive Center (NSIDC DAAC).Greenland Today & Antarctic Ice Sheet Today.A part of CIRES at the University of Colorado Boulder ![]()
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