Lerna, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 17° 33° -23° (1985) 70° (1950) 2.03" 5.6"
February 21° 39° -17° (1996) 74° (2000) 2.08" 4.5"
March 32° 50° -8° (1960) 85° (1981) 3.06" 2.5"
April 42° 62° 17° (1987) 89° (1987) 3.84" 0.1"
May 53° 73° 28° (1966) 95° (1987) 3.95" 0"
June 63° 83° 41° (1992) 105° (1954) 4.21" 0"
July 66° 86° 48° (1962) 111° (1954) 4.16" 0"
August 64° 84° 40° (1986) 104° (1988) 3.25" 0"
September 56° 78° 33° (1983) 103° (1954) 3.06" 0"
October 45° 66° 19° (1962) 92° (1954) 3.02" 0"
November 33° 51° -2° (1950) 82° (1950) 3.71" 1.1"
December 22° 38° -20° (1989) 71° (1998) 2.84" 4.1"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 66° 86° 50° (1984) 97° (1953) 0.14" NA
Jul 2 66° 86° 49° (2001) 98° (1952) 0.14" NA
Jul 3 66° 86° 52° (1959) 96° (1954) 0.14" NA
Jul 4 66° 86° 50° (1968) 99° (1990) 0.14" NA
Jul 5 66° 86° 50° (1964) 100° (1988) 0.14" NA
Jul 6 66° 86° 49° (1972) 96° (1977) 0.14" NA
Jul 7 66° 86° 53° (1983) 98° (1988) 0.14" NA
Jul 8 66° 86° 52° (1961) 100° (1988) 0.14" NA
Jul 9 66° 86° 51° (1963) 99° (1988) 0.14" NA
Jul 10 66° 86° 50° (1963) 99° (1966) 0.14" NA
Jul 11 66° 86° 53° (1953) 97° (1989) 0.14" NA
Jul 12 66° 86° 54° (1973) 106° (1954) 0.14" NA
Jul 13 66° 86° 50° (1975) 102° (1966) 0.14" NA
Jul 14 66° 86° 50° (1950) 111° (1954) 0.14" NA
Jul 15 66° 86° 56° (1950) 102° (1988) 0.14" NA
Jul 16 66° 86° 54° (1967) 99° (1988) 0.14" NA
Jul 17 67° 86° 55° (1985) 101° (1988) 0.14" NA
Jul 18 67° 86° 54° (1979) 107° (1954) 0.13" NA
Jul 19 67° 86° 49° (1984) 100° (1980) 0.13" NA
Jul 20 67° 86° 53° (1970) 104° (1954) 0.13" NA
Jul 21 67° 86° 49° (1970) 98° (1983) 0.13" NA
Jul 22 67° 86° 53° (1970) 100° (1983) 0.13" NA
Jul 23 67° 86° 53° (1985) 100° (1983) 0.13" NA
Jul 24 67° 86° 53° (1948) 95° (1965) 0.13" NA
Jul 25 67° 86° 57° (1950) 97° (1986) 0.13" NA
Jul 26 66° 86° 52° (1977) 100° (1952) 0.13" NA
Jul 27 66° 86° 48° (1962) 99° (1952) 0.13" NA
Jul 28 66° 86° 54° (1962) 97° (1952) 0.12" NA
Jul 29 66° 86° 52° (1971) 97° (1954) 0.12" NA
Jul 30 66° 86° 52° (1971) 100° (1999) 0.12" NA
Jul 31 66° 86° 51° (1971) 98° (1988) 0.12" NA
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