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 20 August 1886 → A hurricane completely destroyed the town of Indianola, TX. After being wiped out, the town was not rebuilt.
 20 August 1971 → Heavy rains caused severe flooding in North Vietnam, killing 100,000.

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August 21, 1989:

Extensive crop damage was done from Correll in Big Stone County to 10 miles north of Appleton. Baseball size hail caused near 100 percent crop damage. Most of Swift County also received 4 to 8 inches of rain.

August 21, 2007:

Thunderstorms produced large hail in southeast South Dakota, mainly near the Missouri River, during the late afternoon and early evening of August 21st. Very large hail fell in the Dante area in Charles Mix County, including a state record size hailstone certified as 6 and 7/8 inches in diameter. Very large hail broke windows, dented vehicles, and damaged roofs in Wagner. Crop damage was also reported. The largest stone was verified at 6 1/8 inches in diameter with a weight of 1.25 pounds. The amount of property and crop damage was not known. A larger hailstone was verified in the town of Dante with 6 7/8 inches in diameter. The storm also produced numerous stones around softball size. Damage included holes in roofs, broken rafters, broken awnings, numerous broken windows and dented vehicles, damaged siding, divots in the ground up to 12 inches long and 3 inches deep, and damaged crops. The amount of property and crop damage was not known. The state record hailstone was broken on July 30th, 2010 with the United States record hailstone in Vivian.


Record Highs: Record Lows:
Aberdeen: 105 (1947) Aberdeen: 37 (2004)
Kennebec: 104 (1976) Kennebec: 39 (1986)
Mobridge: 105 (1947) Mobridge: 44 (1920)
Pierre: 104 (1947) Pierre: 43 (1986)
Sisseton: 102 (1947) Sisseton: 35 (2004)
Timber Lake: 103 (1947) Timber Lake: 42 (1939)
Watertown: 99 (1976) Watertown: 38 (2004)
Wheaton: 101 (1976) Wheaton: 38 (1925)

Record Precipitation:
Aberdeen: 1.80" (1916)
Kennebec: 0.75" (1963)
Mobridge: 1.90" (1930)
Pierre: 0.94" (1906)
Sisseton: 2.58" (1964)
Timber Lake: 1.23" (1954)
Watertown: 2.73" (1916)
Wheaton: 2.32" (1916)


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