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
Mar 1 21° 38° -6° (1989) 62° (1986) 0.03" NA
Mar 2 21° 39° -6° (1989) 62° (1974) 0.03" NA
Mar 3 21° 39° -11° (1989) 64° (1992) 0.03" NA
Mar 4 21° 39° -9° (1978) 62° (2000) 0.03" NA
Mar 5 21° 39° -5° (1980) 69° (1987) 0.03" NA
Mar 6 22° 39° -5° (1995) 71° (1987) 0.03" NA
Mar 7 22° 40° -4° (1995) 68° (1987) 0.03" NA
Mar 8 22° 40° -7° (2003) 69° (1977) 0.03" NA
Mar 9 22° 40° 0° (1969) 68° (1977) 0.03" NA
Mar 10 22° 40° -7° (1998) 75° (1972) 0.03" NA
Mar 11 22° 41° -8° (1998) 76° (1972) 0.03" NA
Mar 12 23° 41° 7° (1993) 72° (2007) 0.03" NA
Mar 13 23° 41° 2° (1997) 64° (2007) 0.03" NA
Mar 14 23° 41° -3° (1997) 69° (2003) 0.04" NA
Mar 15 23° 41° 3° (1997) 64° (1995) 0.04" NA
Mar 16 23° 42° 4° (2002) 66° (1994) 0.04" NA
Mar 17 23° 42° -6° (1965) 61° (1974) 0.04" NA
Mar 18 24° 42° -12° (1965) 68° (2007) 0.04" NA
Mar 19 24° 42° -8° (1965) 69° (2004) 0.04" NA
Mar 20 24° 43° -3° (1965) 72° (1997) 0.04" NA
Mar 21 24° 43° -5° (1965) 66° (1988) 0.04" NA
Mar 22 24° 43° 0° (1965) 67° (1963) 0.04" NA
Mar 23 25° 43° -7° (1965) 67° (1963) 0.04" NA
Mar 24 25° 44° -9° (1965) 69° (1963) 0.04" NA
Mar 25 25° 44° -8° (1965) 69° (1985) 0.04" NA
Mar 26 25° 44° 3° (1965) 70° (2004) 0.05" NA
Mar 27 26° 44° 3° (1975) 71° (1986) 0.05" NA
Mar 28 26° 44° 2° (1975) 74° (1986) 0.05" NA
Mar 29 26° 45° 0° (1987) 72° (1978) 0.05" NA
Mar 30 26° 45° 5° (1975) 78° (1968) 0.05" NA
Mar 31 27° 45° 12° (1972) 73° (2004) 0.05" NA
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