Keystone, Indiana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 17° 32° -24° (1985) 65° (2005) 2.16" 7.5"
February 20° 36° -18° (1975) 74° (2000) 2.11" 6.4"
March 28° 47° -7° (1980) 80° (1998) 2.56" 3.2"
April 40° 60° 8° (1982) 87° (1986) 3.43" 0.7"
May 51° 71° 22° (1989) 92° (2006) 4.54" 0"
June 61° 80° 37° (1972) 100° (1988) 4.13" 0"
July 64° 84° 41° (1988) 104° (1980) 4.28" 0"
August 62° 82° 40° (1986) 99° (1983) 3.6" 0"
September 54° 76° 27° (1989) 97° (1983) 2.96" 0"
October 42° 63° 10° (1988) 90° (2007) 2.79" 0"
November 33° 50° 5° (1976) 78° (2003) 3.18" 0.9"
December 22° 36° -18° (1983) 70° (1998) 2.66" 4.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 45° 66° 27° (1979) 82° (2001) 0.12" 0"
May 2 46° 67° 31° (2008) 85° (2007) 0.12" 0"
May 3 46° 67° 30° (1986) 83° (2001) 0.12" 0"
May 4 46° 67° 29° (2005) 85° (2001) 0.12" 0"
May 5 47° 68° 30° (1973) 85° (2001) 0.13" 0"
May 6 47° 68° 35° (1989) 86° (1982) 0.13" 0"
May 7 47° 68° 22° (1989) 88° (2004) 0.13" 0"
May 8 48° 69° 26° (1989) 83° (2010) 0.13" 0"
May 9 48° 69° 31° (1977) 87° (2007) 0.13" 0"
May 10 49° 69° 32° (1977) 86° (2004) 0.13" 0"
May 11 49° 70° 36° (1977) 87° (1979) 0.14" 0"
May 12 49° 70° 32° (1976) 87° (1987) 0.14" 0"
May 13 50° 70° 33° (1996) 86° (1982) 0.15" 0"
May 14 50° 70° 32° (1973) 87° (1982) 0.14" 0"
May 15 50° 71° 33° (1973) 89° (1982) 0.15" 0"
May 16 51° 71° 34° (1997) 89° (1998) 0.15" 0"
May 17 51° 71° 29° (1973) 89° (1991) 0.15" 0"
May 18 51° 72° 31° (1973) 89° (1987) 0.15" 0"
May 19 52° 72° 31° (2002) 89° (1987) 0.16" 0"
May 20 52° 72° 36° (1993) 91° (1977) 0.16" 0"
May 21 52° 73° 40° (1981) 90° (1975) 0.16" 0"
May 22 53° 73° 37° (1993) 90° (1977) 0.16" 0"
May 23 53° 73° 38° (2006) 88° (1994) 0.16" 0"
May 24 53° 73° 42° (1976) 89° (2007) 0.16" 0"
May 25 54° 74° 37° (1988) 89° (2007) 0.16" 0"
May 26 54° 74° 35° (1988) 89° (1977) 0.16" 0"
May 27 55° 74° 33° (1983) 89° (1985) 0.16" 0"
May 28 55° 75° 40° (1992) 87° (1977) 0.16" 0"
May 29 55° 75° 40° (1979) 91° (1991) 0.17" 0"
May 30 56° 75° 40° (1984) 92° (2006) 0.17" 0"
May 31 56° 76° 40° (1973) 91° (1988) 0.17" 0"
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