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
Feb 1 17° 34° -21° (1996) 65° (1992) 0.01" NA
Feb 2 17° 34° -28° (1989) 58° (1962) 0.01" NA
Feb 3 17° 34° -29° (1989) 64° (1962) 0.01" NA
Feb 4 17° 34° -27° (1989) 62° (2005) 0.02" NA
Feb 5 18° 34° -17° (1982) 65° (1963) 0.02" NA
Feb 6 18° 34° -10° (1994) 58° (1984) 0.02" NA
Feb 7 18° 35° -15° (1994) 59° (1963) 0.02" NA
Feb 8 18° 35° -17° (1994) 59° (2000) 0.02" NA
Feb 9 18° 35° -11° (1975) 64° (1996) 0.02" NA
Feb 10 18° 35° -18° (1981) 58° (1962) 0.02" NA
Feb 11 18° 35° -11° (1981) 57° (2005) 0.02" NA
Feb 12 18° 35° -9° (1986) 61° (1962) 0.02" NA
Feb 13 19° 36° -8° (1995) 62° (1999) 0.02" NA
Feb 14 19° 36° -8° (2007) 58° (1999) 0.02" NA
Feb 15 19° 36° -12° (1979) 57° (1971) 0.02" NA
Feb 16 19° 36° -15° (1979) 57° (1981) 0.02" NA
Feb 17 19° 36° -20° (2006) 57° (2002) 0.02" NA
Feb 18 19° 36° -18° (2006) 60° (1983) 0.02" NA
Feb 19 19° 37° -1° (2006) 57° (1972) 0.02" NA
Feb 20 20° 37° 4° (1962) 58° (1972) 0.02" NA
Feb 21 20° 37° -7° (1963) 68° (1982) 0.02" NA
Feb 22 20° 37° -8° (1963) 61° (2000) 0.02" NA
Feb 23 20° 37° -13° (1965) 60° (1973) 0.02" NA
Feb 24 20° 38° -17° (2003) 62° (1995) 0.02" NA
Feb 25 20° 38° -8° (1994) 64° (1995) 0.02" NA
Feb 26 20° 38° -14° (1962) 60° (1965) 0.02" NA
Feb 27 20° 38° -12° (1962) 64° (1988) 0.03" NA
Feb 28 21° 38° -15° (1962) 62° (1972) 0.03" NA
Feb 29 21° 38° -5° (1996) 64° (1992) 0.03" NA
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