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


Illinois

Average Temperature Rankings, September 2018

View Period (Months):All1234567891011121824364860
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  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 2018
1-Month
70.3°F
(21.3°C)
66.2°F
(19.0°C)
4.1°F
(2.3°C)
116th Coolest Coolest since: 2017 1918
11th Warmest Warmest since: 2016 1925, 1933
Ties: 1921
Aug–Sep 2018
2-Month
72.5°F
(22.5°C)
69.8°F
(21.0°C)
2.7°F
(1.5°C)
114th Coolest Coolest since: 2017 1967
13th Warmest Warmest since: 2016 1936
Ties: 1980
Jul–Sep 2018
3-Month
73.3°F
(22.9°C)
71.7°F
(22.1°C)
1.6°F
(0.8°C)
100th Coolest Coolest since: 2017 1967
27th Warmest Warmest since: 2016 1936
Jun–Sep 2018
4-Month
73.7°F
(23.2°C)
71.6°F
(22.0°C)
2.1°F
(1.2°C)
113th Coolest Coolest since: 2017 1915, 1924
14th Warmest Warmest since: 2016 1936
Ties: 1913, 1925, 1953
May–Sep 2018
5-Month
73.1°F
(22.8°C)
69.7°F
(20.9°C)
3.4°F
(1.9°C)
125th Coolest Coolest since: 2017 1924
2nd Warmest Warmest since: 1936 1936
Apr–Sep 2018
6-Month
68.4°F
(20.2°C)
66.7°F
(19.3°C)
1.7°F
(0.9°C)
107th Coolest Coolest since: 2017 1907
20th Warmest Warmest since: 2016 2010
Ties: 1914, 1959
Mar–Sep 2018
7-Month
64.2°F
(17.9°C)
62.8°F
(17.1°C)
1.4°F
(0.8°C)
103rd Coolest Coolest since: 2017 1924
24th Warmest Warmest since: 2017 2012
Ties: 1930, 2017
Feb–Sep 2018
8-Month
60.2°F
(15.7°C)
58.7°F
(14.8°C)
1.5°F
(0.9°C)
109th Coolest Coolest since: 2015 1904
18th Warmest Warmest since: 2017 2012
Ties: 1931, 1953, 1986, 1999, 2002, 2007
Jan–Sep 2018
9-Month
56.2°F
(13.4°C)
55.0°F
(12.8°C)
1.2°F
(0.6°C)
92nd Coolest Coolest since: 2015 1904, 1912
35th Warmest Warmest since: 2017 2012
Ties: 1941, 1964, 1973
Dec 2017–Sep 2018
10-Month
53.5°F
(11.9°C)
52.4°F
(11.3°C)
1.1°F
(0.6°C)
90th Coolest Coolest since: 2015 1904
36th Warmest Warmest since: 2017 2012
Nov 2017–Sep 2018
11-Month
52.5°F
(11.4°C)
51.4°F
(10.8°C)
1.1°F
(0.6°C)
95th Coolest Coolest since: 2015 1904
31st Warmest Warmest since: 2017 2012
Ties: 1925, 1941, 1976, 2004
Oct 2017–Sep 2018
12-Month
52.9°F
(11.6°C)
51.6°F
(10.9°C)
1.3°F
(0.7°C)
100th Coolest Coolest since: 2015 1904
26th Warmest Warmest since: 2017 2012
Ties: 1914, 1933, 1934
Apr 2017–Sep 2018
18-Month
57.9°F
(14.4°C)
56.7°F
(13.7°C)
1.2°F
(0.7°C)
101st Coolest Coolest since: 2015 1904, 1918
25th Warmest Warmest since: 2017 2012
Ties: 1953
Oct 2016–Sep 2018
24-Month
54.0°F
(12.2°C)
51.7°F
(10.9°C)
2.3°F
(1.3°C)
121st Coolest Coolest since: 2016 1979
4th Warmest Warmest since: 2017 2017
Ties: 1999
Oct 2015–Sep 2018
36-Month
54.4°F
(12.4°C)
51.6°F
(10.9°C)
2.8°F
(1.5°C)
123rd Coolest Coolest since: 2017 1979
1st Warmest Warmest to Date 2018
Oct 2014–Sep 2018
48-Month
53.6°F
(12.0°C)
51.6°F
(10.9°C)
2.0°F
(1.1°C)
121st Coolest Coolest since: 2017 1905
2nd Warmest Warmest to Date 2019
Oct 2013–Sep 2018
60-Month
52.7°F
(11.5°C)
51.6°F
(10.9°C)
1.1°F
(0.6°C)
106th Coolest Coolest since: 2017 1906
16th Warmest Warmest since: 2016 2020
Ties: 1933, 1936, 1956, 2001, 2004, 2005

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published January 2021, retrieved on January 27, 2021 from https://www.ncdc.noaa.gov/cag/