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 August 2022. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 2011

View Period (Months):All1234567891011121824364860
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  • Record Coolest
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  • Top 1/3
  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
September 2011
1-Month
63.6°F
(17.6°C)
66.2°F
(19.0°C)
-2.6°F
(-1.4°C)
17th Coolest Coolest since: 1995 1918
111th Warmest Warmest since: 2010 1925, 1933
Aug–Sep 2011
2-Month
69.2°F
(20.7°C)
69.8°F
(21.0°C)
-0.6°F
(-0.3°C)
42nd Coolest Coolest since: 2009 1967
86th Warmest Warmest since: 2010 1936
Ties: 1923, 1934, 1943, 1969, 2006, 2012, 2014, 2020
Jul–Sep 2011
3-Month
72.8°F
(22.7°C)
71.8°F
(22.1°C)
1.0°F
(0.6°C)
91st Coolest Coolest since: 2009 1967
37th Warmest Warmest since: 2010 1936
Ties: 1906, 1995
Jun–Sep 2011
4-Month
72.8°F
(22.7°C)
71.6°F
(22.0°C)
1.2°F
(0.7°C)
91st Coolest Coolest since: 2009 1915, 1924
37th Warmest Warmest since: 2010 1936
May–Sep 2011
5-Month
70.7°F
(21.5°C)
69.8°F
(21.0°C)
0.9°F
(0.5°C)
90th Coolest Coolest since: 2009 1924
38th Warmest Warmest since: 2010 1936
Ties: 1925, 1986
Apr–Sep 2011
6-Month
67.7°F
(19.8°C)
66.7°F
(19.3°C)
1.0°F
(0.5°C)
88th Coolest Coolest since: 2009 1907
40th Warmest Warmest since: 2010 2010
Ties: 1952, 1953, 1999, 2006
Mar–Sep 2011
7-Month
64.0°F
(17.8°C)
62.9°F
(17.2°C)
1.1°F
(0.6°C)
100th Coolest Coolest since: 2009 1924
28th Warmest Warmest since: 2010 2012
Ties: 2006
Feb–Sep 2011
8-Month
59.8°F
(15.4°C)
58.7°F
(14.8°C)
1.1°F
(0.6°C)
96th Coolest Coolest since: 2009 1904
32nd Warmest Warmest since: 2010 2012
Ties: 1952, 1983
Jan–Sep 2011
9-Month
55.7°F
(13.2°C)
55.0°F
(12.8°C)
0.7°F
(0.4°C)
84th Coolest Coolest since: 2009 1904, 1912
44th Warmest Warmest since: 2010 2012
Dec 2010–Sep 2011
10-Month
52.5°F
(11.4°C)
52.4°F
(11.3°C)
0.1°F
(0.1°C)
69th Coolest Coolest since: 2009 1904
58th Warmest Warmest since: 2010 2012
Ties: 1937, 1948, 1985, 2015
Nov 2010–Sep 2011
11-Month
51.7°F
(10.9°C)
51.4°F
(10.8°C)
0.3°F
(0.1°C)
74th Coolest Coolest since: 2009 1904
53rd Warmest Warmest since: 2010 2012
Ties: 1935, 1981, 1992
Oct 2010–Sep 2011
12-Month
52.1°F
(11.2°C)
51.6°F
(10.9°C)
0.5°F
(0.3°C)
79th Coolest Coolest since: 2009 1904
48th Warmest Warmest since: 2010 2012
Ties: 1900, 1930, 1952
Apr 2010–Sep 2011
18-Month
58.0°F
(14.4°C)
56.6°F
(13.7°C)
1.4°F
(0.7°C)
106th Coolest Coolest since: 2010 1904, 1918
21st Warmest Warmest since: 2007 2012
Ties: 1914, 1935, 1991
Oct 2009–Sep 2011
24-Month
52.6°F
(11.4°C)
51.6°F
(10.9°C)
1.0°F
(0.5°C)
99th Coolest Coolest since: 2010 1979
27th Warmest Warmest since: 2008 2017
Ties: 1914, 1931, 1935, 1953, 2001
Oct 2008–Sep 2011
36-Month
52.1°F
(11.2°C)
51.6°F
(10.9°C)
0.5°F
(0.3°C)
85th Coolest Coolest since: 2010 1979
40th Warmest Warmest since: 2009 2018
Ties: 1936, 1942, 1944, 2009
Oct 2007–Sep 2011
48-Month
52.0°F
(11.1°C)
51.6°F
(10.9°C)
0.4°F
(0.2°C)
79th Coolest Coolest since: 1998 1905
45th Warmest Warmest since: 2010 2019
Ties: 1940, 1949, 1976, 1986, 1998
Oct 2006–Sep 2011
60-Month
52.3°F
(11.3°C)
51.6°F
(10.9°C)
0.7°F
(0.4°C)
87th Coolest Coolest since: 1999 1906
36th Warmest Warmest since: 2010 2020
Ties: 1958, 1989, 1999

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, Average Temperature, published September 2022, retrieved on September 30, 2022 from https://www.ncdc.noaa.gov/cag/