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
Sep 1 13.9° 28.3° 4° (1967) 39° (1913) 0.12" NA
Sep 2 13.3° 28.3° 6° (1987) 38° (1913) 0.12" NA
Sep 3 13.3° 27.8° 4° (1952) 39° (1913) 0.12" NA
Sep 4 13.3° 27.8° 4° (1974) 38° (1925) 0.12" NA
Sep 5 12.8° 27.8° 4° (1974) 38° (1925) 0.12" NA
Sep 6 12.8° 27.8° 4° (1988) 38° (1925) 0.12" NA
Sep 7 12.8° 27.8° 3° (1988) 38° (1922) 0.12" NA
Sep 8 12.2° 27.2° 2° (1986) 37° (1922) 0.12" NA
Sep 9 12.2° 27.2° 2° (1986) 38° (1925) 0.12" NA
Sep 10 12.2° 27.2° 4° (1969) 37° (1933) 0.12" NA
Sep 11 11.7° 27.2° 2° (1917) 38° (1936) 0.12" NA
Sep 12 11.7° 27.2° 2° (1940) 36° (1939) 0.12" NA
Sep 13 11.7° 26.7° 1° (1902) 37° (1939) 0.12" NA
Sep 14 11.1° 26.7° 2° (1923) 38° (1939) 0.12" NA
Sep 15 11.1° 26.7° 2° (1996) 38° (1939) 0.12" NA
Sep 16 11.1° 26.1° 1° (1916) 36° (1927) 0.12" NA
Sep 17 10.6° 26.1° 0° (1937) 36° (1927) 0.12" NA
Sep 18 10.6° 26.1° 1° (1901) 35° (1925) 0.12" NA
Sep 19 10.6° 26.1° 2° (1901) 36° (1925) 0.12" NA
Sep 20 10° 25.6° 0° (1918) 36° (1931) 0.12" NA
Sep 21 10° 25.6° -1° (1991) 35° (1931) 0.11" NA
Sep 22 10° 25.6° 0° (1913) 36° (1956) 0.11" NA
Sep 23 9.4° 25° -2° (1995) 34° (1937) 0.11" NA
Sep 24 9.4° 25° -2° (1989) 34° (1935) 0.11" NA
Sep 25 9.4° 25° -1° (1995) 33.9° (2007) 0.11" NA
Sep 26 8.9° 24.4° -2° (1928) 33° (1920) 0.11" NA
Sep 27 8.9° 24.4° -1° (1940) 33° (1905) 0.1" NA
Sep 28 8.3° 23.9° -4° (1942) 34° (1939) 0.1" NA
Sep 29 8.3° 23.9° 0° (1908) 38° (1953) 0.1" NA
Sep 30 8.3° 23.9° -1° (1949) 34° (1922) 0.1" NA
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