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 April 2020. For more information, please see Climatological Rankings.


Illinois

Average Temperature Rankings, September 2009

View Period (Months):All1234567891011121824364860
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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2019)
Warmest/Coolest
Since
Record
September 2009
1-Month
65.9°F
(18.8°C)
66.2°F
(19.0°C)
-0.3°F
(-0.2°C)
55th Coolest Coolest since: 2006 1918
71st Warmest Warmest since: 2008 1925, 1933
Ties: 1910, 1965
Aug–Sep 2009
2-Month
68.4°F
(20.2°C)
69.8°F
(21.0°C)
-1.4°F
(-0.8°C)
27th Coolest Coolest since: 2004 1967
99th Warmest Warmest since: 2008 1936
Ties: 1907, 1918, 1942, 1999
Jul–Sep 2009
3-Month
69.0°F
(20.6°C)
71.7°F
(22.1°C)
-2.7°F
(-1.5°C)
6th Coolest Coolest since: 1992 1967
120th Warmest Warmest since: 2008 1936
Jun–Sep 2009
4-Month
69.9°F
(21.1°C)
71.6°F
(22.0°C)
-1.7°F
(-0.9°C)
16th Coolest Coolest since: 2004 1915, 1924
110th Warmest Warmest since: 2008 1936
Ties: 1907, 1945, 1958
May–Sep 2009
5-Month
68.5°F
(20.3°C)
69.7°F
(20.9°C)
-1.2°F
(-0.6°C)
23rd Coolest Coolest since: 1997 1924
103rd Warmest Warmest since: 2008 1936
Ties: 1902, 1981
Apr–Sep 2009
6-Month
65.7°F
(18.7°C)
66.7°F
(19.3°C)
-1.0°F
(-0.6°C)
29th Coolest Coolest since: 1997 1907
97th Warmest Warmest since: 2008 2010
Ties: 1918, 1958, 1979
Mar–Sep 2009
7-Month
62.5°F
(16.9°C)
62.8°F
(17.1°C)
-0.3°F
(-0.2°C)
46th Coolest Coolest since: 2008 1924
80th Warmest Warmest since: 2007 2012
Ties: 1897, 1903, 1935, 1937, 1978
Feb–Sep 2009
8-Month
58.8°F
(14.9°C)
58.7°F
(14.8°C)
0.1°F
(0.1°C)
69th Coolest Coolest since: 2008 1904
57th Warmest Warmest since: 2007 2012
Ties: 1927, 1945, 1949, 1985
Jan–Sep 2009
9-Month
54.5°F
(12.5°C)
54.9°F
(12.7°C)
-0.4°F
(-0.2°C)
48th Coolest Coolest since: 2008 1904, 1912
78th Warmest Warmest since: 2007 2012
Ties: 1916, 1989, 2015
Dec 2008–Sep 2009
10-Month
51.8°F
(11.0°C)
52.5°F
(11.4°C)
-0.7°F
(-0.4°C)
38th Coolest Coolest since: 2001 1904
87th Warmest Warmest since: 2008 2012
Ties: 1993, 2001
Nov 2008–Sep 2009
11-Month
50.8°F
(10.4°C)
51.4°F
(10.8°C)
-0.6°F
(-0.4°C)
36th Coolest Coolest since: 2003 1904
89th Warmest Warmest since: 2008 2012
Ties: 1945, 1950, 1968, 1993, 2003, 2015
Oct 2008–Sep 2009
12-Month
51.1°F
(10.6°C)
51.7°F
(10.9°C)
-0.6°F
(-0.3°C)
40th Coolest Coolest since: 2003 1904
85th Warmest Warmest since: 2008 2012
Ties: 1945, 2015
Apr 2008–Sep 2009
18-Month
56.1°F
(13.4°C)
56.7°F
(13.7°C)
-0.6°F
(-0.3°C)
36th Coolest Coolest since: 1997 1904, 1918
89th Warmest Warmest since: 2008 2012
Ties: 1903, 1916
Oct 2007–Sep 2009
24-Month
51.4°F
(10.8°C)
51.6°F
(10.9°C)
-0.2°F
(-0.1°C)
44th Coolest Coolest since: 1997 1979
80th Warmest Warmest since: 2008 2017
Ties: 1897, 1925, 1926, 1958
Oct 2006–Sep 2009
36-Month
52.1°F
(11.2°C)
51.6°F
(10.9°C)
0.5°F
(0.3°C)
85th Coolest Coolest since: 1998 1979
38th Warmest Warmest since: 2008 2018
Ties: 1936, 1942, 1944, 2011
Oct 2005–Sep 2009
48-Month
52.5°F
(11.4°C)
51.6°F
(10.9°C)
0.9°F
(0.5°C)
99th Coolest Coolest since: 2004 1905
23rd Warmest Warmest since: 2008 2019
Ties: 1991
Oct 2004–Sep 2009
60-Month
52.8°F
(11.6°C)
51.5°F
(10.8°C)
1.3°F
(0.8°C)
110th Coolest Coolest since: 2005 1906
11th Warmest Warmest since: 2008 2002
Ties: 1957, 1991, 2016

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published May 2020, retrieved on May 30, 2020 from https://www.ncdc.noaa.gov/cag/