Rock Grove, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 25° -27° (1985) 61° (2002) 1.33" 8.3"
February 14° 31° -27° (1996) 65° (1999) 1.33" 6.8"
March 25° 43° -8° (2002) 85° (1986) 2.14" 6.4"
April 36° 57° 9° (1982) 92° (1980) 3.23" 2"
May 47° 69° 25° (2005) 95° (1985) 3.96" 0.1"
June 57° 78° 38° (1993) 100° (1988) 4.46" 0"
July 62° 82° 46° (1979) 101° (1988) 3.57" 0"
August 59° 80° 40° (1986) 101° (1988) 4.11" 0"
September 50° 73° 28° (1984) 96° (1985) 3.67" 0"
October 39° 61° 15° (1988) 90° (1997) 2.58" 0.1"
November 28° 44° -5° (1977) 77° (2000) 2.69" 2.2"
December 16° 30° -23° (2000) 67° (2001) 1.72" 8.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 42° 63° 27° (1978) 83° (2001) 0.12" NA
May 2 42° 64° 29° (1978) 87° (1992) 0.12" NA
May 3 43° 64° 25° (2005) 81° (2001) 0.12" NA
May 4 43° 65° 25° (2005) 86° (2001) 0.12" NA
May 5 43° 65° 31° (2005) 86° (1980) 0.12" NA
May 6 44° 65° 30° (1989) 88° (1980) 0.12" NA
May 7 44° 66° 27° (1989) 83° (2000) 0.12" NA
May 8 45° 66° 30° (1989) 83° (1988) 0.12" NA
May 9 45° 67° 30° (1983) 89° (1979) 0.12" NA
May 10 45° 67° 27° (1981) 89° (1979) 0.12" NA
May 11 46° 67° 31° (1981) 88° (1979) 0.12" NA
May 12 46° 68° 31° (1981) 88° (1987) 0.12" NA
May 13 46° 68° 34° (1989) 88° (1991) 0.12" NA
May 14 47° 69° 38° (1981) 88° (1998) 0.12" NA
May 15 47° 69° 36° (1997) 89° (2007) 0.13" NA
May 16 48° 69° 29° (1997) 86° (2001) 0.13" NA
May 17 48° 70° 31° (1997) 88° (1977) 0.13" NA
May 18 48° 70° 31° (2002) 90° (1987) 0.13" NA
May 19 49° 70° 31° (2002) 90° (1996) 0.13" NA
May 20 49° 71° 30° (2002) 93° (1975) 0.13" NA
May 21 49° 71° 28° (2002) 90° (1975) 0.13" NA
May 22 50° 71° 38° (1985) 88° (1977) 0.13" NA
May 23 50° 72° 38° (2006) 88° (1975) 0.13" NA
May 24 50° 72° 35° (1992) 93° (1975) 0.13" NA
May 25 51° 72° 34° (1988) 90° (1977) 0.14" NA
May 26 51° 73° 36° (1979) 91° (1977) 0.14" NA
May 27 51° 73° 34° (1992) 95° (1985) 0.14" NA
May 28 52° 73° 36° (1992) 94° (1978) 0.14" NA
May 29 52° 74° 34° (1984) 94° (1991) 0.14" NA
May 30 53° 74° 37° (1996) 90° (2006) 0.14" NA
May 31 53° 74° 42° (1990) 90° (1988) 0.14" NA
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