Illinois, Climate Division 8 August 1991 Average Temperature Rankings
1901-2000
Degrees Fahrenheit
1
76.8
76.0
0.8
87
43
1915
1936
1990
1988
top-third
1901,1932,1953,2012
2
77.6
77.0
0.6
88
42
1967
1936
1990
1988
top-third
1977,1999,2019
3
77.2
75.9
1.3
100
30
1915,1927
1936
1990
1988
top-third
1993
4
75.6
73.2
2.4
120
10
1967
1936
1990
1987
top-tenth
1941,1980,2011
5
72.3
69.6
2.7
124
6
1907
2010
1990
1954
top-tenth
1941,2011
6
68.4
65.5
2.9
126
4
1904
2012
1990
1936
top-tenth
2007
7
64.3
61.1
3.2
128
2
1904
2012
1990
1991
top-tenth
8
59.9
57.3
2.6
121
9
1912
2012
1990
1954
top-tenth
1953,2016
9
57.2
54.8
2.4
118
11
1904
2012
1990
1954
top-tenth
10
56.5
53.8
2.7
123
6
1904
2012
1990
1932
top-tenth
2002
11
56.4
54.1
2.3
120
9
1904
2012
1990
1954
top-tenth
2005,2006
12
57.6
55.4
2.2
120
9
1904
2012
1990
1954
top-tenth
1934,1999
18
60.1
58.7
1.4
107
22
1904
2012
1990
1987
top-third
2008,2018
24
56.5
55.4
1.1
103
25
1979
2017
1990
1987
top-third
2011,2019,2021
36
56.0
55.4
0.6
88
39
1979
2018
1990
1988
top-third
1921,2009
48
56.0
55.3
0.7
88
38
1980
2019
1990
1989
top-third
1939,1941,1989,1992,1993,2015
60
56.2
55.3
0.9
100
25
1906
2020
1990
1957
top-third
1925,1933,1955,2004,2005,2011