Keystone, South Dakota
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 36° -38° (1963) 68° (1981) 0.38" 5.7"
February 19° 37° -29° (1989) 68° (1982) 0.7" 6.8"
March 25° 43° -12° (1965) 78° (1968) 1.19" 8.7"
April 32° 51° 1° (1975) 85° (1989) 2.23" 12"
May 42° 61° 14° (1967) 93° (1969) 4.22" 1.2"
June 51° 71° 27° (1981) 99° (1970) 3.41" 0.1"
July 59° 79° 35° (1986) 100° (2006) 2.9" 0"
August 58° 78° 33° (1968) 99° (1973) 1.99" 0"
September 48° 68° 19° (1985) 97° (1978) 1.81" 0.7"
October 37° 55° 1° (1991) 84° (1976) 1.68" 3.7"
November 26° 43° -12° (1985) 75° (1975) 0.62" 8"
December 18° 35° -31° (1983) 67° (1997) 0.43" 5.5"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 57° 77° 44° (1992) 95° (1990) 0.1" 0"
Jul 2 57° 77° 40° (1972) 99° (1990) 0.09" 0"
Jul 3 57° 77° 40° (1972) 98° (1990) 0.1" 0"
Jul 4 57° 77° 41° (1972) 98° (1989) 0.09" 0"
Jul 5 58° 78° 42° (1997) 96° (1989) 0.09" 0"
Jul 6 58° 78° 35° (1986) 99° (1973) 0.09" 0"
Jul 7 58° 78° 45° (1993) 100° (1985) 0.09" 0"
Jul 8 58° 78° 45° (1965) 99° (1989) 0.09" 0"
Jul 9 58° 79° 47° (1978) 97° (1989) 0.09" 0"
Jul 10 59° 79° 48° (1993) 100° (1985) 0.1" 0"
Jul 11 59° 79° 46° (1993) 100° (1985) 0.09" 0"
Jul 12 59° 79° 42° (1987) 98° (1985) 0.1" 0"
Jul 13 59° 79° 46° (1967) 97° (2003) 0.1" 0"
Jul 14 59° 79° 45° (1970) 98° (1983) 0.09" 0"
Jul 15 59° 80° 46° (1976) 99° (2006) 0.1" 0"
Jul 16 59° 80° 48° (1979) 100° (1974) 0.1" 0"
Jul 17 60° 80° 46° (1972) 97° (1977) 0.09" 0"
Jul 18 60° 80° 50° (1992) 95° (1977) 0.1" 0"
Jul 19 60° 80° 49° (1988) 100° (1983) 0.09" 0"
Jul 20 60° 80° 40° (1988) 96° (1983) 0.1" 0"
Jul 21 60° 80° 43° (1990) 95° (1964) 0.09" 0"
Jul 22 60° 80° 45° (1992) 97° (1974) 0.1" 0"
Jul 23 60° 80° 45° (1992) 96° (1964) 0.09" 0"
Jul 24 60° 80° 45° (1992) 96° (2003) 0.1" 0"
Jul 25 60° 80° 45° (1992) 96° (1963) 0.09" 0"
Jul 26 60° 80° 43° (1979) 94° (1987) 0.09" 0"
Jul 27 60° 80° 42° (2008) 94° (1987) 0.09" 0"
Jul 28 60° 80° 42° (1971) 98° (2006) 0.09" 0"
Jul 29 60° 80° 43° (1971) 97° (2006) 0.09" 0"
Jul 30 60° 80° 45° (1971) 100° (2006) 0.09" 0"
Jul 31 60° 80° 42° (1968) 95° (1987) 0.09" 0"
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