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
May 1 36° 55° 14° (1967) 79° (1987) 0.11" NA
May 2 36° 55° 20° (2005) 80° (1985) 0.11" NA
May 3 36° 56° 19° (1967) 84° (1986) 0.11" NA
May 4 37° 56° 21° (1967) 83° (1966) 0.11" NA
May 5 37° 57° 23° (1976) 84° (2004) 0.11" NA
May 6 37° 57° 30° (1978) 80° (1992) 0.12" NA
May 7 38° 57° 23° (1984) 82° (1966) 0.12" NA
May 8 38° 58° 25° (1979) 84° (1985) 0.12" NA
May 9 38° 58° 24° (1979) 82° (1962) 0.12" NA
May 10 39° 58° 21° (1979) 79° (1985) 0.12" NA
May 11 39° 59° 22° (1967) 80° (1962) 0.13" NA
May 12 39° 59° 24° (1980) 80° (1987) 0.13" NA
May 13 40° 60° 18° (1980) 86° (2001) 0.13" NA
May 14 40° 60° 28° (1974) 88° (1976) 0.13" NA
May 15 40° 60° 33° (1974) 90° (1978) 0.13" NA
May 16 41° 61° 31° (1983) 84° (1978) 0.13" NA
May 17 41° 61° 32° (1968) 84° (1972) 0.13" NA
May 18 41° 61° 30° (2000) 86° (1992) 0.13" NA
May 19 42° 62° 28° (1971) 89° (1992) 0.13" NA
May 20 42° 62° 24° (1963) 84° (1964) 0.13" NA
May 21 43° 62° 26° (1963) 85° (1964) 0.13" NA
May 22 43° 63° 29° (1963) 85° (1980) 0.14" NA
May 23 43° 63° 27° (2002) 91° (1967) 0.14" NA
May 24 44° 64° 25° (2002) 82° (1967) 0.14" NA
May 25 44° 64° 30° (1981) 83° (1985) 0.14" NA
May 26 44° 64° 29° (1984) 87° (1969) 0.14" NA
May 27 45° 65° 25° (1963) 93° (1969) 0.14" NA
May 28 45° 65° 30° (1984) 92° (1969) 0.14" NA
May 29 45° 65° 24° (1984) 89° (2003) 0.13" NA
May 30 46° 66° 25° (1981) 85° (1984) 0.13" NA
May 31 46° 66° 27° (1982) 84° (1984) 0.13" NA
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