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
Apr 1 27° 45° 1° (1975) 73° (2004) 0.05" NA
Apr 2 27° 46° 5° (1975) 69° (1991) 0.05" NA
Apr 3 27° 46° 4° (2002) 69° (1992) 0.05" NA
Apr 4 28° 46° 2° (1968) 73° (1992) 0.06" NA
Apr 5 28° 47° 12° (1982) 73° (1991) 0.06" NA
Apr 6 28° 47° 6° (1979) 73° (1969) 0.06" NA
Apr 7 28° 47° 4° (2007) 74° (1988) 0.06" NA
Apr 8 29° 47° 5° (1997) 76° (2005) 0.06" NA
Apr 9 29° 48° 11° (1973) 75° (1977) 0.06" NA
Apr 10 29° 48° 8° (1997) 78° (1996) 0.06" NA
Apr 11 30° 48° 7° (1997) 78° (1985) 0.06" NA
Apr 12 30° 49° 13° (1997) 78° (1976) 0.07" NA
Apr 13 30° 49° 14° (1997) 74° (2003) 0.07" NA
Apr 14 30° 49° 9° (1986) 77° (1963) 0.07" NA
Apr 15 31° 50° 14° (2000) 80° (1985) 0.07" NA
Apr 16 31° 50° 16° (2000) 73° (1988) 0.07" NA
Apr 17 31° 50° 20° (1989) 77° (1987) 0.07" NA
Apr 18 32° 50° 13° (1966) 81° (1987) 0.08" NA
Apr 19 32° 51° 11° (1966) 78° (1987) 0.08" NA
Apr 20 32° 51° 8° (1966) 82° (1962) 0.08" NA
Apr 21 32° 51° 20° (1993) 83° (1989) 0.08" NA
Apr 22 33° 52° 17° (1967) 85° (1989) 0.08" NA
Apr 23 33° 52° 17° (1963) 81° (1989) 0.09" NA
Apr 24 33° 52° 23° (2006) 79° (1974) 0.09" NA
Apr 25 34° 53° 24° (1988) 78° (1962) 0.09" NA
Apr 26 34° 53° 16° (1994) 76° (1987) 0.09" NA
Apr 27 34° 54° 15° (1984) 78° (2001) 0.1" NA
Apr 28 35° 54° 16° (1994) 79° (1987) 0.1" NA
Apr 29 35° 54° 17° (1990) 78° (1992) 0.1" NA
Apr 30 35° 55° 14° (2005) 81° (1992) 0.1" NA
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