This Day in National/World Weather History ...
 18 April 1880 → Marshfield, MO was devastated by an F4 (estimated) tornado that killed 68 people in the town in just a few minutes, with another 24 dying later of their injuries.
 18 April 1905 → Hail up to one inch in diameter, accompanied by strong winds that blew it into drifts six inches tall, struck Spanish Wells, Bahamas. Hail is exceedingly rare in the Bahamas.
 18 April 1906 → San Francisco was shaken by a severe earthquake. Unusual easterly winds helped to spread the ensuing fires, nearly destroying the city. The Weather Bureau offices at San Francisco and San Jose were demolished.
 18 April 1949 → Tornadoes are extremely rare in Nevada, however on this date a low-end F2 twister struck near Reno. It was on the ground for 12 miles and damaged ranch buildings.
 18 April 1957 → A dust devil in Massachusetts lifted a small child 3 feet into the air and rolled 2 other children on the ground. Fortunately none were hurt. The dust devil was accompanied by a loud whistling sound as it moved westward. It occurred at the beginning of an unusual early season heat wave.

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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.