Animation of Monthly Mean Snow Cover Extent (grey) and Sea Ice Extent (white). Data derived from weekly snow and sea-ice cover data for the period 1971 to 1995. The data were taken from a dataset compiled by Armstrong and Brodzik (2002). The animation runs from August to August, which is the month with minimum snow cover extent in the northern hemisphere.
Source: R.D. Brown. 2002. Meteorological Service of Canada. Environment Canada.