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
Jul 1 16.7° 30° 9° (1918) 41° (1931) 0.14" NA
Jul 2 16.7° 30.6° 9° (1904) 38° (1925) 0.13" NA
Jul 3 16.7° 30.6° 9° (1924) 38° (1911) 0.13" NA
Jul 4 16.7° 30.6° 7° (1940) 41° (1936) 0.13" NA
Jul 5 16.7° 30.6° 9° (1915) 41° (1936) 0.13" NA
Jul 6 16.7° 30.6° 8° (1972) 39° (1936) 0.13" NA
Jul 7 16.7° 30.6° 9° (1972) 40° (1936) 0.13" NA
Jul 8 16.7° 30.6° 10° (1901) 39° (1936) 0.13" NA
Jul 9 17.2° 30.6° 11° (1918) 41° (1936) 0.13" NA
Jul 10 17.2° 30.6° 9° (1996) 41° (1936) 0.13" NA
Jul 11 17.2° 30.6° 9° (1996) 42° (1936) 0.13" NA
Jul 12 17.2° 30.6° 9° (1999) 43° (1954) 0.13" NA
Jul 13 17.2° 30.6° 9° (1975) 42° (1936) 0.13" NA
Jul 14 17.2° 30.6° 7° (1975) 46° (1954) 0.13" NA
Jul 15 17.2° 30.6° 6° (1930) 43° (1936) 0.13" NA
Jul 16 17.2° 30.6° 7° (1930) 41° (1914) 0.12" NA
Jul 17 17.2° 30.6° 9° (1911) 39° (1936) 0.12" NA
Jul 18 17.2° 30.6° 9° (1924) 42° (1954) 0.12" NA
Jul 19 17.2° 31.1° 10° (1979) 43° (1934) 0.12" NA
Jul 20 17.2° 30.6° 11° (1929) 43° (1934) 0.12" NA
Jul 21 17.2° 30.6° 8° (1944) 44° (1934) 0.12" NA
Jul 22 17.2° 30.6° 8° (1947) 43° (1901) 0.12" NA
Jul 23 17.2° 30.6° 9° (1947) 43° (1934) 0.12" NA
Jul 24 17.2° 30.6° 11° (1906) 43° (1934) 0.12" NA
Jul 25 17.2° 30.6° 10° (2000) 42° (1934) 0.12" NA
Jul 26 17.2° 30.6° 6° (1911) 42° (1936) 0.12" NA
Jul 27 17.2° 30.6° 9° (1962) 42° (1936) 0.12" NA
Jul 28 17.2° 30.6° 9° (2004) 42° (1930) 0.12" NA
Jul 29 17.2° 30.6° 9° (1971) 40° (1913) 0.11" NA
Jul 30 17.2° 30.6° 10° (1971) 39° (1913) 0.11" NA
Jul 31 16.7° 30.6° 9° (1918) 38° (1916) 0.11" NA
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