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


Illinois

Average Temperature Rankings, September 2015

View Period (Months):All1234567891011121824364860
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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
September 2015
1-Month
70.4°F
(21.3°C)
66.2°F
(19.0°C)
4.2°F
(2.3°C)
118th Coolest Coolest since: 2014 1918
10th Warmest Warmest since: 2005 1925, 1933
Aug–Sep 2015
2-Month
71.2°F
(21.8°C)
69.9°F
(21.1°C)
1.3°F
(0.7°C)
94th Coolest Coolest since: 2014 1967
34th Warmest Warmest since: 2010 1936
Ties: 1908, 1937
Jul–Sep 2015
3-Month
72.2°F
(22.3°C)
71.8°F
(22.1°C)
0.4°F
(0.2°C)
75th Coolest Coolest since: 2014 1967
53rd Warmest Warmest since: 2012 1936
Ties: 1895, 1970, 1986
Jun–Sep 2015
4-Month
72.0°F
(22.2°C)
71.6°F
(22.0°C)
0.4°F
(0.2°C)
76th Coolest Coolest since: 2014 1915, 1924
52nd Warmest Warmest since: 2012 1936
Ties: 1906, 1937, 1940, 1948, 2017
May–Sep 2015
5-Month
70.6°F
(21.4°C)
69.7°F
(20.9°C)
0.9°F
(0.5°C)
87th Coolest Coolest since: 2014 1924
41st Warmest Warmest since: 2012 1936
Ties: 1895
Apr–Sep 2015
6-Month
67.9°F
(19.9°C)
66.7°F
(19.3°C)
1.2°F
(0.6°C)
96th Coolest Coolest since: 2014 1907
32nd Warmest Warmest since: 2012 2010
Ties: 1944, 1980, 2019, 2021
Mar–Sep 2015
7-Month
63.7°F
(17.6°C)
62.9°F
(17.2°C)
0.8°F
(0.4°C)
90th Coolest Coolest since: 2014 1924
38th Warmest Warmest since: 2012 2012
Ties: 1919, 1964
Feb–Sep 2015
8-Month
58.1°F
(14.5°C)
58.6°F
(14.8°C)
-0.5°F
(-0.3°C)
43rd Coolest Coolest since: 2014 1904
85th Warmest Warmest since: 2012 2012
Ties: 1937, 1984, 1997, 2003
Jan–Sep 2015
9-Month
54.5°F
(12.5°C)
54.9°F
(12.7°C)
-0.4°F
(-0.2°C)
48th Coolest Coolest since: 2014 1904, 1912
80th Warmest Warmest since: 2013 2012
Ties: 1916, 1989, 2009
Dec 2014–Sep 2015
10-Month
52.5°F
(11.4°C)
52.4°F
(11.3°C)
0.1°F
(0.1°C)
69th Coolest Coolest since: 2014 1904
58th Warmest Warmest since: 2013 2012
Ties: 1937, 1948, 1985, 2011
Nov 2014–Sep 2015
11-Month
50.8°F
(10.4°C)
51.3°F
(10.7°C)
-0.5°F
(-0.3°C)
36th Coolest Coolest since: 2014 1904
91st Warmest Warmest since: 2013 2012
Ties: 1945, 1950, 1968, 1993, 2003, 2009
Oct 2014–Sep 2015
12-Month
51.1°F
(10.6°C)
51.6°F
(10.9°C)
-0.5°F
(-0.3°C)
40th Coolest Coolest since: 2014 1904
87th Warmest Warmest since: 2013 2012
Ties: 1945, 2009
Apr 2014–Sep 2015
18-Month
56.2°F
(13.4°C)
56.7°F
(13.7°C)
-0.5°F
(-0.3°C)
39th Coolest Coolest since: 2014 1904, 1918
88th Warmest Warmest since: 2013 2012
Ties: 1907, 1940
Oct 2013–Sep 2015
24-Month
50.2°F
(10.1°C)
51.7°F
(10.9°C)
-1.5°F
(-0.8°C)
6th Coolest Coolest since: 1979 1979
120th Warmest Warmest since: 2014 2017
Oct 2012–Sep 2015
36-Month
50.8°F
(10.4°C)
51.6°F
(10.9°C)
-0.8°F
(-0.5°C)
14th Coolest Coolest since: 1981 1979
111th Warmest Warmest since: 2014 2018
Ties: 1920, 1960, 1963, 1970, 1971, 1981
Oct 2011–Sep 2015
48-Month
52.2°F
(11.2°C)
51.6°F
(10.9°C)
0.6°F
(0.3°C)
84th Coolest Coolest since: 2011 1905
40th Warmest Warmest since: 2014 2019
Ties: 1939, 1954
Oct 2010–Sep 2015
60-Month
52.1°F
(11.2°C)
51.5°F
(10.8°C)
0.6°F
(0.4°C)
78th Coolest Coolest since: 1998 1906
45th Warmest Warmest since: 2014 2020
Ties: 1937, 1938, 1945, 1954, 1993

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published October 2021, retrieved on October 28, 2021 from https://www.ncdc.noaa.gov/cag/