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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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November 5, 1959:

A strong cold front brought near blizzard conditions and bitter cold temperatures. High temperatures in many locations only reached the upper teens. Some daytime highs include; 19 degrees in Pierre and Waubay; 18 degrees in Aberdeen, Faulkton, Kennebec, Pollock and Roscoe; 17 degree in Eureka, Gettysburg, Mobridge and Watertown; and 15 degrees in Timber Lake and near McIntosh. Some record or near record lows also occurred near midnight on the 5th. Some lows include; 2 degrees in Aberdeen; 1 degree near McIntosh; 0 degrees in Timber Lake and Pollock; and 2 degree below zero in Kennebec.


Record Highs: Record Lows:
Aberdeen: 79 (1904) Aberdeen: -6 (2003)
Kennebec: 84 (2001) Kennebec: -5 (1951)
Mobridge: 73 (1916) Mobridge: -3 (1959)
Pierre: 80 (1975) Pierre: 3 (1959)
Sisseton: 78 (1975) Sisseton: -4 (1951)
Timber Lake: 74 (2001) Timber Lake: -7 (1935)
Watertown: 73 (2001) Watertown: -1 (1951)
Wheaton: 78 (2001) Wheaton: -3 (1951)

Record Precipitation: Record Snowfall:
Aberdeen: 0.70" (1895) Aberdeen: 4.5" (1925)
Kennebec: 0.45" (1922) Kennebec: 0.5" (1993)
Mobridge: 0.81" (2008) Mobridge: 6.1" (1943)
Pierre: 0.30" (2008) Pierre: 0.6" (1959)
Sisseton: 0.51" (1958) Sisseton: 2.0" (1936)
Timber Lake: 0.83" (1948) Timber Lake: 4.0" (1943)
Watertown: 0.34" (1959) Watertown: 1.9" (1959)
Wheaton: 0.78" (1958) Wheaton: 2.0" (1991)


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