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
Nov 1 32° 49° 4° (1991) 70° (1980) 0.03" 0.3"
Nov 2 31° 49° -5° (1991) 71° (2008) 0.03" 0.2"
Nov 3 31° 49° 2° (1991) 67° (1978) 0.03" 0.3"
Nov 4 31° 48° 8° (1973) 70° (1975) 0.02" 0.3"
Nov 5 30° 48° 5° (2003) 75° (1975) 0.03" 0.2"
Nov 6 30° 47° 1° (1991) 70° (2010) 0.03" 0.3"
Nov 7 30° 47° 8° (1971) 74° (1999) 0.02" 0.3"
Nov 8 29° 46° 9° (1971) 70° (1999) 0.03" 0.3"
Nov 9 29° 46° 1° (1986) 67° (2001) 0.03" 0.4"
Nov 10 28° 45° -8° (1986) 67° (2001) 0.02" 0.3"
Nov 11 28° 45° -8° (1986) 67° (2005) 0.03" 0.3"
Nov 12 28° 45° -8° (1986) 70° (1999) 0.02" 0.3"
Nov 13 27° 44° -5° (1986) 69° (1999) 0.03" 0.3"
Nov 14 27° 44° 2° (1978) 71° (1975) 0.02" 0.3"
Nov 15 26° 43° 2° (1968) 68° (1975) 0.02" 0.3"
Nov 16 26° 43° 6° (2000) 66° (2001) 0.02" 0.4"
Nov 17 25° 42° 8° (1996) 67° (1999) 0.02" 0.3"
Nov 18 25° 42° 5° (1978) 69° (2008) 0.01" 0.2"
Nov 19 25° 41° -5° (1978) 64° (1989) 0.02" 0.3"
Nov 20 24° 41° -8° (1978) 59° (1962) 0.02" 0.3"
Nov 21 24° 40° -4° (1978) 62° (1974) 0.01" 0.2"
Nov 22 23° 40° -7° (1985) 68° (2002) 0.02" 0.3"
Nov 23 23° 39° -10° (1985) 59° (2005) 0.02" 0.2"
Nov 24 22° 39° -10° (1993) 62° (1984) 0.01" 0.2"
Nov 25 22° 39° -10° (1993) 60° (1970) 0.01" 0.2"
Nov 26 22° 38° -5° (1985) 65° (1998) 0.02" 0.2"
Nov 27 21° 38° -12° (1985) 64° (1998) 0.01" 0.2"
Nov 28 21° 38° -4° (1985) 60° (1998) 0.01" 0.2"
Nov 29 21° 37° -7° (1985) 58° (1973) 0.02" 0.2"
Nov 30 20° 37° -10° (1985) 62° (1999) 0.01" 0.2"
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