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 May 2021. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 1900

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Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 1900
1-Month
68.3°F
(20.2°C)
66.2°F
(19.0°C)
2.1°F
(1.2°C)
93rd Coolest Coolest since: 1899 1918
34th Warmest Warmest since: 1898 1925, 1933
Ties: 1955, 1970
Aug–Sep 1900
2-Month
73.6°F
(23.1°C)
69.9°F
(21.1°C)
3.7°F
(2.0°C)
123rd Coolest Coolest since: 1899 1967
4th Warmest Warmest to Date 1936
Jul–Sep 1900
3-Month
73.9°F
(23.3°C)
71.7°F
(22.1°C)
2.2°F
(1.2°C)
113th Coolest Coolest since: 1899 1967
14th Warmest Warmest to Date 1936
Ties: 2010, 2019
Jun–Sep 1900
4-Month
73.0°F
(22.8°C)
71.6°F
(22.0°C)
1.4°F
(0.8°C)
94th Coolest Coolest since: 1899 1915, 1924
33rd Warmest Warmest to Date 1936
Ties: 1939
May–Sep 1900
5-Month
71.2°F
(21.8°C)
69.8°F
(21.0°C)
1.4°F
(0.8°C)
99th Coolest Coolest since: 1899 1924
28th Warmest Warmest to Date 1936
Ties: 1901, 1922, 1954, 1983
Apr–Sep 1900
6-Month
68.0°F
(20.0°C)
66.7°F
(19.3°C)
1.3°F
(0.7°C)
97th Coolest Coolest since: 1899 1907
30th Warmest Warmest since: 1896 2010
Ties: 1964
Mar–Sep 1900
7-Month
63.2°F
(17.3°C)
62.9°F
(17.2°C)
0.3°F
(0.1°C)
66th Coolest Coolest since: 1899 1924
61st Warmest Warmest since: 1898 2012
Ties: 1910
Feb–Sep 1900
8-Month
58.0°F
(14.4°C)
58.6°F
(14.8°C)
-0.6°F
(-0.4°C)
37th Coolest Coolest since: 1899 1904
90th Warmest Warmest since: 1898 2012
Ties: 1901, 1903, 1909, 1972, 2013
Jan–Sep 1900
9-Month
54.9°F
(12.7°C)
54.9°F
(12.7°C)
0.0°F
(0.0°C)
63rd Coolest Coolest since: 1899 1904, 1912
64th Warmest Warmest since: 1898 2012
Ties: 1906
Dec 1899–Sep 1900
10-Month
52.2°F
(11.2°C)
52.4°F
(11.3°C)
-0.2°F
(-0.1°C)
53rd Coolest Coolest since: 1899 1904
73rd Warmest Warmest since: 1898 2012
Ties: 1927, 1936, 1977
Nov 1899–Sep 1900
11-Month
51.5°F
(10.8°C)
51.3°F
(10.7°C)
0.2°F
(0.1°C)
67th Coolest Coolest since: 1899 1904
59th Warmest Warmest since: 1898 2012
Ties: 1972, 1980
Oct 1899–Sep 1900
12-Month
52.1°F
(11.2°C)
51.7°F
(10.9°C)
0.4°F
(0.3°C)
79th Coolest Coolest since: 1899 1904
47th Warmest Warmest since: 1898 2012
Ties: 1930, 1952, 2011
Apr 1899–Sep 1900
18-Month
57.1°F
(13.9°C)
56.7°F
(13.7°C)
0.4°F
(0.2°C)
77th Coolest Coolest since: 1899 1904, 1918
49th Warmest Warmest to Date 2012
Ties: 1923, 1972, 1981
Oct 1898–Sep 1900
24-Month
50.7°F
(10.4°C)
51.6°F
(10.9°C)
-0.9°F
(-0.5°C)
16th Coolest Coolest to Date 1979
109th Warmest Warmest since: 1899 2017
Ties: 1924, 1961, 1963, 1970, 1982
Oct 1897–Sep 1900
36-Month
51.2°F
(10.7°C)
51.6°F
(10.9°C)
-0.4°F
(-0.2°C)
33rd Coolest Coolest since: 1899 1979
91st Warmest Warmest since: 1898 2018
Ties: 1902, 1913, 1927, 1984, 1994
Oct 1896–Sep 1900
48-Month
51.3°F
(10.7°C)
51.6°F
(10.9°C)
-0.3°F
(-0.2°C)
34th Coolest Coolest since: 1899 1905
89th Warmest Warmest to Date 2019
Ties: 1903, 1909, 1928, 1930, 1951, 1960, 1964, 1965, 1984
Oct 1895–Sep 1900
60-Month
51.3°F
(10.7°C)
51.6°F
(10.9°C)
-0.3°F
(-0.2°C)
35th Coolest Coolest to Date 1906
87th Warmest Warmest to Date 2020
Ties: 1910, 1960, 1966, 1967, 1973

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published June 2021, retrieved on June 12, 2021 from https://www.ncdc.noaa.gov/cag/