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 2017

View Period (Months):All1234567891011121824364860
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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2021)
Warmest/Coolest
Since
Record
September 2017
1-Month
68.8°F
(20.4°C)
66.2°F
(19.0°C)
2.6°F
(1.4°C)
99th Coolest Coolest since: 2014 1918
29th Warmest Warmest since: 2016 1925, 1933
Ties: 1911, 1919
Aug–Sep 2017
2-Month
69.6°F
(20.9°C)
69.8°F
(21.0°C)
-0.2°F
(-0.1°C)
58th Coolest Coolest since: 2014 1967
70th Warmest Warmest since: 2016 1936
Ties: 1945, 1968, 1977
Jul–Sep 2017
3-Month
71.8°F
(22.1°C)
71.7°F
(22.1°C)
0.1°F
(0.0°C)
68th Coolest Coolest since: 2014 1967
60th Warmest Warmest since: 2016 1936
Ties: 1932, 1952, 1999, 2006
Jun–Sep 2017
4-Month
72.0°F
(22.2°C)
71.6°F
(22.0°C)
0.4°F
(0.2°C)
76th Coolest Coolest since: 2015 1915, 1924
52nd Warmest Warmest since: 2016 1936
Ties: 1906, 1937, 1940, 1948, 2015
May–Sep 2017
5-Month
70.0°F
(21.1°C)
69.7°F
(20.9°C)
0.3°F
(0.2°C)
71st Coolest Coolest since: 2014 1924
57th Warmest Warmest since: 2016 1936
Ties: 1943, 1949, 2013, 2020
Apr–Sep 2017
6-Month
67.8°F
(19.9°C)
66.8°F
(19.3°C)
1.0°F
(0.6°C)
91st Coolest Coolest since: 2014 1907
37th Warmest Warmest since: 2016 2010
Ties: 1895, 2001
Mar–Sep 2017
7-Month
64.2°F
(17.9°C)
62.8°F
(17.1°C)
1.4°F
(0.8°C)
103rd Coolest Coolest since: 2015 1924
25th Warmest Warmest since: 2016 2012
Ties: 1930, 2018
Feb–Sep 2017
8-Month
61.4°F
(16.3°C)
58.7°F
(14.8°C)
2.7°F
(1.5°C)
121st Coolest Coolest since: 2015 1904
7th Warmest Warmest since: 2016 2012
Jan–Sep 2017
9-Month
58.1°F
(14.5°C)
54.9°F
(12.7°C)
3.2°F
(1.8°C)
124th Coolest Coolest since: 2016 1904, 1912
4th Warmest Warmest since: 2012 2012
Dec 2016–Sep 2017
10-Month
55.2°F
(12.9°C)
52.4°F
(11.3°C)
2.8°F
(1.6°C)
121st Coolest Coolest since: 2015 1904
6th Warmest Warmest since: 2016 2012
Nov 2016–Sep 2017
11-Month
54.5°F
(12.5°C)
51.3°F
(10.7°C)
3.2°F
(1.8°C)
122nd Coolest Coolest since: 2015 1904
5th Warmest Warmest since: 2016 2012
Oct 2016–Sep 2017
12-Month
55.0°F
(12.8°C)
51.6°F
(10.9°C)
3.4°F
(1.9°C)
123rd Coolest Coolest since: 2015 1904
4th Warmest Warmest since: 2016 2012
Apr 2016–Sep 2017
18-Month
59.5°F
(15.3°C)
56.6°F
(13.7°C)
2.9°F
(1.6°C)
125th Coolest Coolest since: 2016 1904, 1918
2nd Warmest Warmest since: 2016 2012
Ties: 2016
Oct 2015–Sep 2017
24-Month
55.1°F
(12.8°C)
51.6°F
(10.9°C)
3.5°F
(1.9°C)
125th Coolest Coolest since: 2016 1979
1st Warmest Warmest to Date 2017
Oct 2014–Sep 2017
36-Month
53.8°F
(12.1°C)
51.6°F
(10.9°C)
2.2°F
(1.2°C)
122nd Coolest Coolest since: 2016 1979
3rd Warmest Warmest since: 2012 2018
Ties: 2007, 2012
Oct 2013–Sep 2017
48-Month
52.7°F
(11.5°C)
51.6°F
(10.9°C)
1.1°F
(0.6°C)
104th Coolest Coolest since: 2016 1905
20th Warmest Warmest since: 2013 2019
Ties: 1988, 2003, 2021
Oct 2012–Sep 2017
60-Month
52.5°F
(11.4°C)
51.6°F
(10.9°C)
0.9°F
(0.5°C)
97th Coolest Coolest since: 2015 1906
26th Warmest Warmest since: 2016 2020
Ties: 1925, 1942, 2000, 2014

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published October 2021, retrieved on October 20, 2021 from https://www.ncdc.noaa.gov/cag/