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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]
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 ]
The weather of 2012 marked the fewest fatalities from natural disasters in a decade, although there were several damaging and deadly floods, tropical cyclones, tornadoes, and other weather events. These include blizzards , cold waves , droughts, heat waves , and wildfires .
A developing winter storm as viewed over the United States on December 19. The 2011–12 winter opened with a nor'easter striking parts of the Mid-Atlantic and Northeastern United States in late October. The storm brought significant snowfall totals to much of the region, with some areas experiencing gale-force winds.
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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.
Part of the 2012–13 North American winter The November 2012 nor'easter was a powerful nor'easter that brought significant early season snow to the Northeastern United States . Many of the areas hit by the storm had been affected by Hurricane Sandy days before, which further complicated recovery efforts.