Jacksonville, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -8° -31.1° (1927) 23.9° (1950) 1.59" 4.5"
February -6° -33.3° (1934) 26.7° (1932) 1.76" 4.6"
March -2° 11° -25.6° (1948) 32.8° (1907) 2.72" 2.3"
April 18° -12.2° (1920) 34.4° (1930) 4.03" 0.3"
May 10° 24° -3.3° (1966) 39.4° (1934) 4.81" 0"
June 15° 28° 2.2° (1993) 41.7° (1931) 4.58" 0"
July 17° 30° 6.1° (1930) 45.6° (1954) 3.95" 0"
August 16° 30° 3.9° (1986) 44.4° (1934) 3.42" 0"
September 11° 26° -3.9° (1942) 39.4° (1913) 3.53" 0"
October 20° -12.8° (1925) 35° (1922) 3.01" 0"
November 12° -20.6° (1929) 28.9° (1937) 3.62" 0.5"
December -6° -31.1° (1944) 23.3° (1998) 2.5" 5.2"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 17° 30° 9° (1918) 41° (1931) 0.12" 0"
Jul 2 17° 30° 9° (1904) 38° (1925) 0.13" 0"
Jul 3 17° 30° 9° (1924) 38° (1911) 0.13" 0"
Jul 4 17° 30° 7° (1940) 41° (1936) 0.12" 0"
Jul 5 17° 30° 9° (1915) 41° (1936) 0.13" 0"
Jul 6 17° 30° 8° (1972) 39° (1936) 0.13" 0"
Jul 7 17° 30° 9° (1972) 40° (1936) 0.13" 0"
Jul 8 17° 30° 10° (1901) 39° (1936) 0.13" 0"
Jul 9 18° 30° 11° (1918) 41° (1936) 0.13" 0"
Jul 10 18° 30° 9° (1996) 41° (1936) 0.12" 0"
Jul 11 18° 30° 9° (1996) 42° (1936) 0.13" 0"
Jul 12 18° 30° 9° (1999) 43° (1954) 0.12" 0"
Jul 13 18° 30° 9° (1975) 42° (1936) 0.13" 0"
Jul 14 18° 30° 7° (1975) 46° (1954) 0.13" 0"
Jul 15 18° 30° 6° (1930) 43° (1936) 0.13" 0"
Jul 16 18° 30° 7° (1930) 41° (1914) 0.12" 0"
Jul 17 17° 30° 9° (1911) 39° (1936) 0.13" 0"
Jul 18 17° 30° 9° (1924) 42° (1954) 0.12" 0"
Jul 19 17° 30° 10° (1979) 43° (1934) 0.13" 0"
Jul 20 17° 30° 11° (1929) 43° (1934) 0.12" 0"
Jul 21 17° 30° 8° (1944) 44° (1934) 0.12" 0"
Jul 22 17° 30° 8° (1947) 43° (1901) 0.13" 0"
Jul 23 17° 30° 9° (1947) 43° (1934) 0.13" 0"
Jul 24 17° 30° 11° (1906) 43° (1934) 0.14" 0"
Jul 25 17° 30° 10° (2000) 42° (1934) 0.13" 0"
Jul 26 17° 30° 6° (1911) 42° (1936) 0.14" 0"
Jul 27 17° 30° 9° (1962) 42° (1936) 0.13" 0"
Jul 28 17° 30° 9° (2004) 42° (1930) 0.12" 0"
Jul 29 17° 30° 9° (1971) 40° (1913) 0.13" 0"
Jul 30 17° 30° 10° (1971) 39° (1913) 0.12" 0"
Jul 31 17° 30° 9° (1918) 38° (1916) 0.13" 0"
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