Jacksonville, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -9° -31.1° (1927) 23.9° (1950) 1.35" 6.6"
February -7° -33.3° (1934) 26.7° (1932) 1.69" 6.5"
March -2° 11° -25.6° (1948) 32.8° (1907) 3.18" 2.3"
April 18° -12.2° (1920) 34.4° (1930) 3.77" 0.4"
May 23° -3.3° (1966) 39.4° (1934) 4.86" 0"
June 15° 28° 2.2° (1993) 41.7° (1931) 4.36" 0"
July 17° 31° 6.1° (1930) 45.6° (1954) 3.85" 0"
August 16° 29° 3.9° (1986) 44.4° (1934) 3.35" 0"
September 11° 26° -3.9° (1942) 39.4° (1913) 3.46" 0"
October 20° -12.8° (1925) 35° (1922) 2.61" 0"
November -1° 11° -20.6° (1929) 28.9° (1937) 3.45" 1.2"
December -7° -31.1° (1944) 23.3° (1998) 2.54" 5.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 -3.9° 7.2° -13° (1964) 18° (1982) 0.11" NA
Dec 2 -3.9° 6.7° -19° (1929) 20° (1982) 0.11" NA
Dec 3 -4.4° 6.7° -23° (1929) 22° (1982) 0.1" NA
Dec 4 -4.4° 6.7° -17° (1929) 22° (1970) 0.1" NA
Dec 5 -4.4° 6.1° -17° (1991) 23° (1998) 0.1" NA
Dec 6 -5° 6.1° -18° (1977) 20° (1932) 0.1" NA
Dec 7 -5° 5.6° -20° (1976) 22° (1980) 0.1" NA
Dec 8 -5° 5.6° -20° (1917) 21° (1946) 0.1" NA
Dec 9 -5.6° 5.6° -21° (1917) 23° (1991) 0.09" NA
Dec 10 -5.6° -24° (1917) 18° (1918) 0.09" NA
Dec 11 -5.6° -24° (1917) 22° (1949) 0.09" NA
Dec 12 -6.1° 4.4° -22° (1962) 17° (1979) 0.09" NA
Dec 13 -6.1° 4.4° -22° (1903) 19° (1948) 0.09" NA
Dec 14 -6.1° 4.4° -22° (1901) 18° (1975) 0.09" NA
Dec 15 -6.7° 3.9° -25° (1901) 22° (1948) 0.08" NA
Dec 16 -6.7° 3.9° -26° (1932) 17° (1939) 0.08" NA
Dec 17 -6.7° 3.9° -23° (1914) 18° (1984) 0.08" NA
Dec 18 -7.2° 3.3° -22° (1932) 19° (1939) 0.08" NA
Dec 19 -7.2° 3.3° -28° (1901) 16° (1957) 0.08" NA
Dec 20 -7.2° 3.3° -27° (1989) 19° (1949) 0.07" NA
Dec 21 -7.2° 3.3° -26° (1989) 17° (1967) 0.07" NA
Dec 22 -7.8° 2.8° -28° (1989) 18° (1933) 0.07" NA
Dec 23 -7.8° 2.8° -29° (1989) 21° (1933) 0.07" NA
Dec 24 -7.8° 2.8° -27° (1989) 18° (1955) 0.07" NA
Dec 25 -7.8° 2.2° -25° (1983) 19° (1936) 0.07" NA
Dec 26 -8.3° 2.2° -31° (1944) 19° (1942) 0.06" NA
Dec 27 -8.3° 2.2° -23° (1983) 19° (1946) 0.06" NA
Dec 28 -8.3° 2.2° -27° (1924) 18° (1946) 0.06" NA
Dec 29 -8.3° 2.2° -24° (1917) 23° (1984) 0.06" NA
Dec 30 -8.3° 1.7° -26° (1909) 19° (1965) 0.06" NA
Dec 31 -8.9° 1.7° -22° (1939) 19° (2002) 0.06" NA
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