Illinois August 1999 Average Temperature Rankings
1901-2000
Degrees Fahrenheit
1
71.7
73.4
-1.7
27
103
1915
1947
1997
1998
bottom-third
1912,1965
2
75.2
74.5
0.7
87
43
1915
1936
1998
1995
top-third
3
74.2
73.5
0.7
88
42
1915
1936
1998
1995
top-third
1899,1918,1925,1937,1938,1984
4
71.7
70.6
1.1
90
40
1915
1936
1997
1998
top-third
1922,1954
5
68.2
66.8
1.4
104
26
1907
1934
1997
1998
top-third
2016
6
63.2
62.3
0.9
88
42
1950,1960
2012
1997
1998
top-third
1973,2018
7
59.5
57.6
1.9
115
15
1904
2012
1997
1998
top-third
8
55.2
53.6
1.6
103
27
1912
2012
1997
1998
top-third
9
53.0
50.9
2.1
111
18
1904
2012
1997
1998
top-third
1953,2007
10
52.2
49.9
2.3
115
14
1904
2012
1997
1998
top-third
1954,2007
11
52.6
50.3
2.3
116
13
1904
2012
1997
1998
top-tenth
1987
12
54.2
51.6
2.6
123
6
1904
2012
1998
1991
top-tenth
1991,2006
18
57.4
55.2
2.2
125
4
1904
2012
1998
1932
top-tenth
1932,2006
24
54.0
51.6
2.4
124
4
1905
2017
1998
1999
top-tenth
2000,2018
36
52.8
51.6
1.2
105
22
1979
2018
1998
1988
top-third
48
52.1
51.6
0.5
84
42
1905
2019
1998
1993
top-third
1937,1939,1940,1943,1949,1954,1976,1987,2011
60
52.3
51.6
0.7
86
39
1906
2020
1998
1995
top-third
1943,1958,1995,2011