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 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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September 12, 1931:

On this day in 1931, near record or record heat came to an end across central and northeast South Dakota as well as west central Minnesota. From September 9th through the 12th, many record highs were set at Aberdeen, Kennebec, Mobridge, Timber Lake, Watertown, and Wheaton. High temperatures during this four-day period ranged from 95 degrees to 109 degrees. Aberdeen rose to 107 degrees on the 10th, Kennebec rose to 109 on the 9th, Mobridge rose to 105 on the 9th, Timber Lake’s high was 106 on the 9th, Watertown rose to 104 on the 10th, and Wheaton rose to 108 degrees on the 10th.


Record Highs: Record Lows:
Aberdeen: 97 (1931) Aberdeen: 24 (1902)
Kennebec: 102 (2004) Kennebec: 25 (1902)
Mobridge: 102 (1939) Mobridge: 32 (1989)
Pierre: 101 (1939) Pierre: 34 (1974)
Sisseton: 95 (1969) Sisseton: 30 (1902)
Timber Lake: 98 (1939) Timber Lake: 29 (1989)
Watertown: 96 (1990) Watertown: 24 (1902)
Wheaton: 95 (1931) Wheaton: 32 (1918)

Record Precipitation:
Aberdeen: 1.81" (1897)
Kennebec: 0.75" (1982)
Mobridge: 1.43" (1961)
Pierre: 0.89" (1985)
Sisseton: 1.06" (1982)
Timber Lake: 1.45" (1961)
Watertown: 1.52" (2005)
Wheaton: 1.57" (1965)


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