This Day in National/World Weather History ...
 21 August 1883 → What was likely an F5 tornado devastated the north side of Rochester, MN. The tornado derailed a train and leveled farms. 40 people were killed.
 21 August 1888 → A "grand spectacle" of four waterspouts near Jacobson, MD overturned boats and moved ashore. 15 people were injured. Another tornado moved east-northeast near Still Pond, MD killing 10 people in a cannery. A total of 11 deaths and 40 injuries were reported from this tornado.
 21 August 1918 → Tyler, MN suffered a direct hit by an F4 tornado. Six hundred buildings were damaged or destroyed and 36 lives were taken, including three when the town's hospital was struck.
 21 August 1984 → The State Fair in Pueblo, CO had to be closed during a vicious hailstorm. Nine people were hurt, including one seriously.

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December 20, 1967:

Freezing drizzle added a thin coating of ice over a previous ice coating that had been created on the 16th of the month over eastern South Dakota and still existed in most areas. An ice coating remained over many areas in eastern South Dakota through the end of the month.

December 20, 1991:

Light freezing drizzle and freezing rain developed over northern South Dakota from Timber Lake to Webster. Numerous car accidents were attributed to slippery conditions. The Aberdeen Police Department reported 24 accidents in Aberdeen, but only one resulted in an injury. Numerous businesses closed and schools were canceled.

December 20, 1993:

Strong winds, accompanied by existing snow cover and one to five inches of new snow, caused blizzard conditions in parts of north central and eastern South Dakota from the 20th to 22nd. A man died in a weather-related crash of a small plane near Isabel on the night of the 20th. The heaviest new snowfall of four to five inches was located in the Sisseton Hills in northeast South Dakota, while the north central part of the state generally received only an inch or two of new snow.

December 20, 2008:

Arctic air combined with blustery northwest winds brought extreme wind chills to central and northeast South Dakota and west central Minnesota from the late afternoon of the 20th until the afternoon of the 21st. Wind chills of 35 below to 45 below zero were common across the area.

Record Highs: Record Lows:
Aberdeen: 60 (1893) Aberdeen: -29 (1916)
Kennebec: 70 (1941) Kennebec: -35 (1916)
Mobridge: 61 (1957) Mobridge: -24 (1989)
Pierre: 62 (1941) Pierre: -18 (1989)
Sisseton: 52 (1979) Sisseton: -26 (1983)
Timber Lake: 58 (1941) Timber Lake: -20 (1990)
Watertown: 55 (1941) Watertown: -30 (1916)
Wheaton: 53 (1956) Wheaton: -31 (1916)

Record Precipitation: Record Snowfall:
Aberdeen: 0.36" (2010) Aberdeen: 5.0" (1967)
Kennebec: 0.34" (1902) Kennebec: 5.0" (1902)
Mobridge: 0.31" (1967) Mobridge: 4.1" (1967)
Pierre: 0.61" (1902) Pierre: 4.7" (1902)
Sisseton: 0.72" (1902) Sisseton: 7.2" (1902)
Timber Lake: 0.33" (2010) Timber Lake: 1.8" (2010)
Watertown: 0.55" (2010) Watertown: 5.0" (2010)
Wheaton: 0.24" (2008) Wheaton: 4.2" (2008) is the U.S. government's official web portal to all federal, state and local government web resources and services.