Climate at a Glance

Statewide Rankings

Look up monthly rankings for 1-12, 18, 24, 36, 48, and 60-month time periods using the options below. Data and statistics are as of December 2020. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 1978

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 1978
1-Month
70.1°F
(21.2°C)
66.2°F
(19.0°C)
3.9°F
(2.2°C)
114th Coolest Coolest since: 1977 1918
13th Warmest Warmest since: 1939 1925, 1933
Aug–Sep 1978
2-Month
71.6°F
(22.0°C)
69.9°F
(21.1°C)
1.7°F
(0.9°C)
98th Coolest Coolest since: 1977 1967
29th Warmest Warmest since: 1960 1936
Ties: 1921, 1922
Jul–Sep 1978
3-Month
72.7°F
(22.6°C)
71.7°F
(22.1°C)
1.0°F
(0.5°C)
88th Coolest Coolest since: 1977 1967
39th Warmest Warmest since: 1959 1936
Ties: 1987
Jun–Sep 1978
4-Month
72.6°F
(22.6°C)
71.7°F
(22.1°C)
0.9°F
(0.5°C)
89th Coolest Coolest since: 1977 1915, 1924
38th Warmest Warmest since: 1959 1936
Ties: 1895, 1897, 1922, 1938
May–Sep 1978
5-Month
70.2°F
(21.2°C)
69.7°F
(20.9°C)
0.5°F
(0.3°C)
77th Coolest Coolest since: 1976 1924
50th Warmest Warmest since: 1977 1936
Ties: 1956, 1962, 1995
Apr–Sep 1978
6-Month
67.3°F
(19.6°C)
66.7°F
(19.3°C)
0.6°F
(0.3°C)
77th Coolest Coolest since: 1976 1907
50th Warmest Warmest since: 1977 2010
Ties: 1932, 1948
Mar–Sep 1978
7-Month
62.5°F
(16.9°C)
62.9°F
(17.2°C)
-0.4°F
(-0.3°C)
46th Coolest Coolest since: 1975 1924
81st Warmest Warmest since: 1977 2012
Ties: 1897, 1903, 1935, 1937, 2009
Feb–Sep 1978
8-Month
56.8°F
(13.8°C)
58.7°F
(14.8°C)
-1.9°F
(-1.0°C)
12th Coolest Coolest since: 1967 1904
115th Warmest Warmest since: 1977 2012
Ties: 1899, 1967
Jan–Sep 1978
9-Month
52.2°F
(11.2°C)
54.9°F
(12.7°C)
-2.7°F
(-1.5°C)
5th Coolest Coolest since: 1924 1904, 1912
122nd Warmest Warmest since: 1977 2012
Dec 1977–Sep 1978
10-Month
49.6°F
(9.8°C)
52.4°F
(11.3°C)
-2.8°F
(-1.5°C)
3rd Coolest Coolest since: 1904 1904
123rd Warmest Warmest since: 1977 2012
Nov 1977–Sep 1978
11-Month
48.9°F
(9.4°C)
51.4°F
(10.8°C)
-2.5°F
(-1.4°C)
5th Coolest Coolest since: 1951 1904
121st Warmest Warmest since: 1977 2012
Ties: 1951
Oct 1977–Sep 1978
12-Month
49.1°F
(9.5°C)
51.6°F
(10.9°C)
-2.5°F
(-1.4°C)
4th Coolest Coolest since: 1918 1904
122nd Warmest Warmest since: 1977 2012
Ties: 1979
Apr 1977–Sep 1978
18-Month
55.8°F
(13.2°C)
56.7°F
(13.7°C)
-0.9°F
(-0.5°C)
23rd Coolest Coolest since: 1977 1904, 1918
103rd Warmest Warmest since: 1976 2012
Ties: 1910, 1927, 1958, 1970, 1994
Oct 1976–Sep 1978
24-Month
49.7°F
(9.8°C)
51.6°F
(10.9°C)
-1.9°F
(-1.1°C)
4th Coolest Coolest since: 1918 1979
121st Warmest Warmest since: 1977 2017
Oct 1975–Sep 1978
36-Month
50.7°F
(10.4°C)
51.6°F
(10.9°C)
-0.9°F
(-0.5°C)
8th Coolest Coolest since: 1962 1979
116th Warmest Warmest since: 1977 2018
Ties: 1907, 1912, 1919, 1928, 1962
Oct 1974–Sep 1978
48-Month
50.9°F
(10.5°C)
51.6°F
(10.9°C)
-0.7°F
(-0.4°C)
15th Coolest Coolest since: 1971 1905
108th Warmest Warmest since: 1977 2019
Ties: 1912, 1919, 1927, 1961, 1971
Oct 1973–Sep 1978
60-Month
51.1°F
(10.6°C)
51.6°F
(10.9°C)
-0.5°F
(-0.3°C)
23rd Coolest Coolest since: 1971 1906
99th Warmest Warmest since: 1977 2020
Ties: 1909, 1912, 1964, 1983, 1997

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published January 2021, retrieved on January 16, 2021 from https://www.ncdc.noaa.gov/cag/