Keystone, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 16° 33° -38° (1963) 68° (1981) 0.38" 5.1"
February 19° 36° -29° (1989) 68° (1982) 0.55" 6.6"
March 23° 42° -12° (1965) 78° (1968) 1.17" 8.3"
April 31° 50° 1° (1975) 85° (1989) 2.21" 10.1"
May 41° 61° 14° (1967) 93° (1969) 3.95" 1.9"
June 51° 72° 27° (1981) 99° (1970) 3.74" 0.2"
July 58° 79° 35° (1986) 100° (2006) 3.16" 0"
August 58° 77° 33° (1968) 99° (1973) 2.04" 0"
September 49° 67° 19° (1985) 97° (1978) 1.55" 0.7"
October 37° 55° 1° (1991) 84° (1976) 1.58" 2.3"
November 25° 41° -12° (1985) 75° (1975) 0.64" 7.2"
December 18° 34° -31° (1983) 67° (1997) 0.46" 6.6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 54° 73° 35° (1974) 95° (1983) 0.06" NA
Sep 2 53° 72° 36° (1974) 94° (1970) 0.06" NA
Sep 3 53° 72° 36° (1974) 92° (1978) 0.05" NA
Sep 4 53° 72° 31° (1962) 94° (2001) 0.05" NA
Sep 5 52° 71° 33° (1965) 95° (1978) 0.05" NA
Sep 6 52° 71° 35° (1986) 97° (1978) 0.05" NA
Sep 7 52° 70° 33° (1986) 94° (1978) 0.05" NA
Sep 8 51° 70° 34° (1962) 90° (1979) 0.05" NA
Sep 9 51° 70° 31° (1962) 94° (1979) 0.05" NA
Sep 10 50° 69° 32° (1962) 90° (1979) 0.05" NA
Sep 11 50° 69° 25° (1989) 86° (1966) 0.05" NA
Sep 12 50° 68° 30° (1970) 90° (1981) 0.05" NA
Sep 13 49° 68° 26° (1970) 89° (1990) 0.05" NA
Sep 14 49° 68° 27° (1993) 87° (2006) 0.05" NA
Sep 15 49° 67° 30° (1982) 84° (1968) 0.05" NA
Sep 16 48° 67° 24° (1965) 89° (1979) 0.05" NA
Sep 17 48° 67° 25° (1965) 92° (2000) 0.05" NA
Sep 18 48° 66° 25° (1965) 87° (1998) 0.05" NA
Sep 19 47° 66° 27° (1983) 85° (1984) 0.05" NA
Sep 20 47° 65° 23° (1983) 80° (1969) 0.05" NA
Sep 21 47° 65° 21° (1995) 79° (1969) 0.05" NA
Sep 22 46° 65° 24° (1995) 84° (1967) 0.05" NA
Sep 23 46° 64° 24° (1984) 86° (1992) 0.05" NA
Sep 24 45° 64° 25° (1984) 83° (1992) 0.05" NA
Sep 25 45° 64° 19° (1984) 84° (1987) 0.05" NA
Sep 26 45° 63° 20° (1965) 86° (1974) 0.05" NA
Sep 27 44° 63° 21° (1984) 84° (1963) 0.05" NA
Sep 28 44° 63° 20° (1984) 84° (1980) 0.06" NA
Sep 29 44° 62° 19° (1985) 80° (1967) 0.06" NA
Sep 30 43° 62° 20° (1985) 85° (1980) 0.06" NA
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