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Arctic winters may have got shorter by a month. Arctic lakes have been found to be freezing up later in the year and thawing earlier, creating a winter ice season about 24 days shorter than it was in 1950. Satellite imagery has also confirmed that climate change has dramatically affected the thickness of lake ice at the coldest point in the season: In 2011, Arctic lake ice was up to 38 centimeters thinner than it was in 1950. The study of more than 400 lakes of the North Slope of Alaska is the first time researchers have been able to document the magnitude of lake-ice changes in the region over such a long period of time.