Illinois, Climate Division 2 May 1980 Average Temperature Rankings
1901-2000
Degrees Fahrenheit
1
60.6
59.0
1.6
84
46
1907
1977
1979
1977
normal
2
53.8
53.4
0.4
72
58
1907
1977
1979
1977
normal
1908,1938
3
46.6
47.5
-0.9
44
86
1926
2012
1979
1977
normal
1951,2008
4
40.0
41.9
-1.9
28
102
1904
2012
1979
1977
bottom-third
1958
5
36.4
37.7
-1.3
30
100
1912
2012
1979
1977
bottom-third
1907,1948,1958
6
35.5
35.8
-0.3
49
80
1904
2012
1979
1977
normal
1945,1966,2001,2015
7
35.9
36.1
-0.2
52
77
1904
2012
1979
1976
normal
1897,1961,1967
8
37.9
38.1
-0.2
51
78
1904
2012
1979
1976
normal
1969,1989
9
40.8
41.0
-0.2
50
79
1904
2012
1979
1976
normal
1908,1923,1925,1969,1993
10
43.8
44.0
-0.2
50
79
1904
2012
1979
1976
normal
11
46.3
46.6
-0.3
43
86
1904
2012
1979
1976
bottom-third
1908,1967,2009
12
48.2
48.5
-0.3
45
84
1904
2012
1979
1976
normal
1907,1913,1946,1967
18
42.4
44.2
-1.8
6
122
1905,1918
2017
1979
1978
bottom-tenth
24
47.3
48.5
-1.2
12
116
1905
2017
1979
1977
bottom-tenth
36
46.9
48.4
-1.5
5
122
1918
2000
1979
1978
bottom-tenth
48
46.9
48.4
-1.5
2
124
1907
2001,2023
1918
1979
bottom-tenth
1905,1906,1918
60
47.5
48.4
-0.9
9
116
1908
2002
1979
1979
bottom-tenth
1918,1979