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 30 July 1119 → The earliest tornado reported on the European mainland struck Vysehrad, Czechia (today Prague, Czech Republic). It destroyed the palace of a Czech duke.
 30 July 1997 → Two waterspouts moved onshore in northern Virginia Beach, VA. One tracked into Norfolk.
 30 July 1999 → At nine o'clock in the morning Chicago recorded its highest ever dew point temperature of 82 degrees. The temperature at the time was 88, resulting in a heat index of 108. The dew point is an indication of the amount of moisture in the air.

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April 20, 2007:

Severe thunderstorms moved through parts of central and northeast South Dakota during the afternoon and evening hours, producing large hail. The largest hail measured 1.75 inches in diameter and fell 3 miles east of Westport, in Brown County.


Record Highs: Record Lows:
Aberdeen: 93 (1980) Aberdeen: 11 (1966)
Kennebec: 96 (1980) Kennebec: 8 (1966)
Mobridge: 93 (1980) Mobridge: 10 (1966)
Pierre: 95 (1980) Pierre: 12 (1966)
Sisseton: 94 (1980) Sisseton: 19 (1966)
Timber Lake: 94 (1980) Timber Lake: 9 (1966)
Watertown: 90 (1980) Watertown: 15 (1907)
Wheaton: 91 (1980) Wheaton: 20 (1966)

Record Precipitation: Record Snowfall:
Aberdeen: 1.37" (1957) Aberdeen: 2.0" (1904)
Kennebec: 1.69" (1974) Kennebec: 4.0" (1959)
Mobridge: 2.25" (1971) Mobridge: 0.7" (1951)
Pierre: 0.82" (1920) Pierre: 7.9" (1920)
Sisseton: 1.14" (1957) Sisseton: 0.5" (1978)
Timber Lake: 1.61" (1971) Timber Lake: 2.0" (1951)
Watertown: 1.24" (2004) Watertown: 4.0" (1917)
Wheaton: 1.40" (1957) Wheaton: Trace (1917)


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