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
Dec 1 27° 43° 10° (1985) 70° (1970) 0.11" NA
Dec 2 27° 43° 7° (1985) 66° (1950) 0.11" NA
Dec 3 27° 42° 5° (1966) 68° (1970) 0.11" NA
Dec 4 26° 42° 4° (1991) 71° (1998) 0.11" NA
Dec 5 26° 42° 13° (1964) 67° (1956) 0.11" NA
Dec 6 26° 41° 0° (1977) 70° (1998) 0.11" NA
Dec 7 25° 41° 1° (1977) 65° (1966) 0.1" NA
Dec 8 25° 40° 4° (1958) 65° (1966) 0.1" NA
Dec 9 25° 40° -4° (1958) 64° (1952) 0.1" NA
Dec 10 24° 40° -3° (1977) 65° (1971) 0.1" NA
Dec 11 24° 39° -4° (1962) 63° (1979) 0.1" NA
Dec 12 24° 39° -8° (1962) 64° (1991) 0.1" NA
Dec 13 23° 39° -3° (1962) 64° (1975) 0.09" NA
Dec 14 23° 38° -4° (1963) 65° (1984) 0.09" NA
Dec 15 23° 38° -11° (1951) 71° (1948) 0.09" NA
Dec 16 22° 38° -9° (1989) 66° (1984) 0.09" NA
Dec 17 22° 37° -5° (1989) 63° (1984) 0.09" NA
Dec 18 22° 37° -10° (1983) 61° (1962) 0.09" NA
Dec 19 21° 37° -12° (1983) 59° (1988) 0.09" NA
Dec 20 21° 37° -7° (1981) 65° (1988) 0.09" NA
Dec 21 21° 36° -18° (1989) 63° (1967) 0.08" NA
Dec 22 21° 36° -20° (1989) 56° (1957) 0.08" NA
Dec 23 20° 36° -16° (1989) 59° (1996) 0.08" NA
Dec 24 20° 35° -16° (1983) 60° (1955) 0.08" NA
Dec 25 20° 35° -14° (1983) 54° (1971) 0.08" NA
Dec 26 19° 35° -5° (1983) 58° (1954) 0.08" NA
Dec 27 19° 35° -1° (1950) 63° (1971) 0.08" NA
Dec 28 19° 35° -1° (1961) 68° (1984) 0.08" NA
Dec 29 19° 34° -6° (1983) 65° (1984) 0.08" NA
Dec 30 18° 34° -9° (1983) 66° (1965) 0.07" NA
Dec 31 18° 34° -11° (1967) 66° (1951) 0.07" NA
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