It has not felt much like December so far across parts of the United States, but by later this week practically nobody will feel like December in the Lower 48 states as above-average temperatures take over virtually the entire country.
In some parts of the country, temperatures will soar up to 30 degrees above early-December averages at times this week. Below are the forecast details.
Cold Air Stays Bottled Up North
As we start meteorological winter, which runs from Dec. 1 through Feb. 29, true arctic air remains locked up in extreme northern Canada, well to the north of the U.S. border and even well north of all the major Canadian cities.
Friday, at least 16 Canadian cities set daily record highs, particularly in Manitoba, where the city of Morden, southwest of Winnipeg, soared to 14.2 degrees Celsius (about 57.6 degrees Fahrenheit). An additional fourteen daily record highs were set in Manitoba Saturday-Sunday, including Emerson (7.1 degrees Celcius/44.8 degrees Fahrenheit on Sunday) where records date back to 1877.
Highs reached the freezing mark as far north as Thompson, Manitoba on Friday (roughly 55 degrees north latitude, about 470 miles north of Winnipeg). The average high on December 4, there, is -13.8C (7.1 degrees F). Just a bit farther northeast of there on Saturday, Gillam, Manitoba, reached the freezing mark which also was a new daily record (0.3 degrees Celcius / 32.5 degrees Fahrenheit).
In the U.S., both Marquette, Michigan (50 degrees at the NWS office in nearby Negaunee Township), and International Falls, Minnesota (45 degrees), tied their daily record highs Friday.
On Saturday, International Falls tied its record warmest low temperature for the month of December, only dipping to 36 degrees just before midnight. Then on Sunday a daily record high of 45 degrees was set. So much for the "Nation's Icebox," at least for awhile.
http://www.weather.com/forecast/national/news/warm-united-states-december-2015
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