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
Jan 1 -8.9° 1.7° -24° (1968) 18° (2005) 0.06" NA
Jan 2 -8.9° 1.7° -27° (1928) 16.1° (2006) 0.05" NA
Jan 3 -8.9° 1.7° -26° (1904) 20° (1997) 0.05" NA
Jan 4 -9.4° 1.1° -26° (1940) 17° (1997) 0.05" NA
Jan 5 -9.4° 1.1° -29° (1999) 17° (1997) 0.05" NA
Jan 6 -9.4° 1.1° -27° (1999) 20° (1907) 0.05" NA
Jan 7 -9.4° 1.1° -31° (1912) 21° (1965) 0.05" NA
Jan 8 -9.4° 1.1° -23° (1942) 19° (1939) 0.05" NA
Jan 9 -9.4° 1.1° -23° (1982) 17.8° (2006) 0.05" NA
Jan 10 -9.4° 1.1° -28° (1982) 17° (1933) 0.05" NA
Jan 11 -9.4° 1.1° -27° (1977) 18° (1911) 0.04" NA
Jan 12 -9.4° 1.1° -30° (1918) 19° (1936) 0.04" NA
Jan 13 -9.4° 1.1° -29° (1912) 19° (2005) 0.04" NA
Jan 14 -9.4° 1.1° -26° (1957) 22° (1928) 0.04" NA
Jan 15 -10° 1.1° -31° (1927) 19° (1949) 0.04" NA
Jan 16 -10° 1.1° -27° (1977) 17° (1933) 0.04" NA
Jan 17 -10° 1.1° -28° (1977) 22° (1990) 0.04" NA
Jan 18 -10° 1.1° -29° (1930) 18° (1951) 0.04" NA
Jan 19 -10° 1.1° -27° (1994) 22° (1952) 0.04" NA
Jan 20 -9.4° 1.1° -29° (1985) 21° (1906) 0.04" NA
Jan 21 -9.4° 1.1° -28° (1985) 21° (1957) 0.04" NA
Jan 22 -9.4° 1.1° -28° (1930) 21° (1967) 0.04" NA
Jan 23 -9.4° 1.1° -27° (1936) 23° (1909) 0.04" NA
Jan 24 -9.4° 1.1° -28° (1915) 24° (1950) 0.04" NA
Jan 25 -9.4° 1.7° -24° (1940) 23° (1950) 0.04" NA
Jan 26 -9.4° 1.7° -27° (1936) 18° (1911) 0.04" NA
Jan 27 -9.4° 1.7° -28° (1936) 20° (1944) 0.04" NA
Jan 28 -9.4° 1.7° -29° (1915) 20° (1970) 0.04" NA
Jan 29 -9.4° 1.7° -25° (1966) 19° (2002) 0.04" NA
Jan 30 -8.9° 2.2° -27° (1936) 18° (1988) 0.04" NA
Jan 31 -8.9° 2.2° -26° (1965) 16° (1988) 0.04" NA
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