This Day in National/World Weather History ...
 21 December 1944 → The Battle of the Bulge lasted from December 16, 1944 to January 25, 1945. By this time Germany was clearly losing World War II and Hitler was hoping to regain advantage if the attack would occur in bad weather to prevent the Allied Air Forces from being effective. As the Americans occupied the strategic position of Bastogne, the German army surrounded the city. However because of bad weather, planes were unable to fly and provide supplies by air drop to the American Forces. On December 29 the weather finally cleared up and much needed supplies were received. The Americans then launched a counteroffensive, but soldiers had to fight the cold and snow as well.
 21 December 1967 → The City Hall and a large portion of the business district of Potosi, MO was destroyed by an F4 tornado. There were 52 injuries and 3 deaths.

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December 2, 1978:

A low pressure center moved northeast from Kansas, causing snow to fall over all of southern Minnesota south of a line from Alexandria to Duluth on the 2nd and 3rd, with the heaviest snow falling from west central and southwest Minnesota to west central Wisconsin. Snow depths of six inches or more fell in southwest Minnesota with 10 inches or more at Marshall, MN. Winds averaged near 20 mph, and temperatures ranged from 5 to 15 degrees above zero while the snow fell, but the snow did not cause extensive problems for the area. Wheaton had 2 inches, Artichoke Lake and Browns Valley had 3 inches.

December 2, 1984:

Snow fell in the central and northeast parts of South Dakota from the late afternoon of the 1st to the morning of the 2nd, with amounts ranging from 3 to 10 inches. The heaviest amounts were in the northeast part of the state with Day County reporting 8 to 10 inches. Five inches of snow fell at Clear Lake, six inches fell at Waubay, Clark, Miller, and 12 miles southwest of Harrold with 7 inches at Redfield.

December 2, 2005:

Heavy snow of 6 to 8 inches fell across much of Jones, Faulk, and Spink counties from the morning to the late evening of the 2nd. Redfield had 6 inches of snowfall with 8 inches at Murdo.

Record Highs: Record Lows:
Aberdeen: 56 (2012) Aberdeen: -20 (1896)
Kennebec: 70 (1998) Kennebec: -20 (1919)
Mobridge: 57 (1959) Mobridge: -18 (1985)
Pierre: 67 (2012) Pierre: -14 (1985)
Sisseton: 59 (1941) Sisseton: -16 (1976)
Timber Lake: 61 (1949) Timber Lake: -24 (1985)
Watertown: 56 (1998) Watertown: -16 (1985)
Wheaton: 57 (1998) Wheaton: -21 (1927)

Record Precipitation: Record Snowfall:
Aberdeen: 0.98" (1909) Aberdeen: 4.5" (1928)
Kennebec: 0.47" (1933) Kennebec: 3.0" (2005)
Mobridge: 0.33" (1996) Mobridge: 6.2" (1996)
Pierre: 0.71" (1933) Pierre: 2.7" (1996)
Sisseton: 0.65" (1982) Sisseton: 5.0" (1945)
Timber Lake: 0.87" (1913) Timber Lake: 6.0" (1913)
Watertown: 0.29" (2008) Watertown: 4.0" (2005)
Wheaton: 0.72" (2007) Wheaton: 7.6" (2007) is the U.S. government's official web portal to all federal, state and local government web resources and services.