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While there is no well-agreed-upon date used to indicate the start of winter in the Northern Hemisphere, there are two definitions of winter which may be used. Based on the astronomical definition, winter begins at the winter solstice, which in 2012 occurred late on December 21, and ends at the March equinox, which in 2013 occurred on March 20. [1]
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On October 20, 2011, the National Oceanic and Atmospheric Administration's Climate Prediction Center issued its U.S. Winter Outlook. The outlook expected the present La Niña to persist and intensify into the winter, resulting in drier than normal conditions in the drought-stricken states of New Mexico, Oklahoma, Texas, and parts of adjacent states.
On November 21, 2013, the National Oceanic and Atmospheric Administration's Climate Prediction Center issued its U.S. Winter Outlook. Sea surface temperatures had been near average since spring 2012, and forecasters expected these conditions to continue through winter 2013–14, with neither El Niño nor La Niña conditions expected to affect the season's climate.
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The 2013 extreme weather events included several all-time temperature records in Northern and Southern Hemisphere. The February extent of snow cover in Eurasia and North America was above average, while the extent of Arctic ice in the same month was 4.5% below the 1981–2010 average. [ 1 ]