Illinois, Climate Division 7 October 1999 Average Temperature Rankings
1901-2000
Degrees Fahrenheit
1
56.0
55.7
0.3
70
60
1925
1963
1997
1998
normal
1935,2011
2
61.5
61.6
-0.1
67
63
1917
1971,2016
1996
1998
normal
1944,1962
3
65.3
65.8
-0.5
50
80
1976
1947,2007
1997
1998
normal
1924,1928,1989
4
68.8
68.4
0.4
75
55
1967
1936
1997
1998
normal
1944,2015
5
69.6
69.2
0.4
78
52
1917
1936
1997
1998
normal
1932,1949,2015
6
68.8
68.2
0.6
80
50
1917
1936
1997
1998
normal
1926,1970,1971,1995
7
66.9
66.0
0.9
92
38
1907
2010
1997
1998
top-third
1987,2001
8
63.5
63.0
0.5
79
51
1917
2012
1997
1998
normal
1956
9
60.7
59.5
1.2
100
30
1917
2012
1997
1998
top-third
1919,1925,1959
10
57.5
56.3
1.2
96
34
1979
2012
1997
1998
top-third
2018
11
55.6
54.0
1.6
108
21
1904
2012
1997
1998
top-third
1922,1931,2010
12
54.8
53.1
1.7
111
18
1904
2012
1997
1998
top-third
1995
18
60.0
58.1
1.9
122
7
1904
2012
1998
1954
top-tenth
24
55.2
53.1
2.1
122
6
1979
2017
1998
1954
top-tenth
2018
36
54.2
53.0
1.2
106
21
1979
2018
1998
1992
top-third
1921,1935,1991,2004
48
53.5
53.0
0.5
80
46
1905,1980
2019
1998
1998
normal
1950,1986,1998,2011,2015
60
53.8
53.0
0.8
90
35
1982
2020
1998
1995
top-third
1995