The 2013–14 North American winter refers to winter in North America as it occurred across the North American continent from late 2013 through early 2014. 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 2013 occurred on December 21, and ends at the March equinox, which in 2014 occurred on March 20. Based on the meteorological definition, the first day of winter is December 1 and the last day February 28. Both definitions involve a period of approximately three months, with some variability. Overall, this was the 14th coldest winter and the coldest of the 21st century to date. A near-record Negative Artic Oscillation and Contsant moisture brought the U.S it's 7th largest snowpack in 65 years. Detroit and Toledo it's snowiest winter on record. Even topping the winter of 1976-77. However, the reason this winter wasn't top 10 cold, was because of above-average temperatures across parts of the southwest.