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


Illinois

Average Temperature Rankings, September 2020

View Period (Months):All1234567891011121824364860
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  • Record Coolest
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  • Top 1/10
  • Record Warmest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2020)
Warmest/Coolest
Since
Record
September 2020
1-Month
65.6°F
(18.7°C)
66.2°F
(19.0°C)
-0.6°F
(-0.3°C)
48th Coolest Coolest since: 2014 1918
79th Warmest Warmest since: 2019 1925, 1933
Ties: 1914, 1946, 1952, 1956
Aug–Sep 2020
2-Month
69.2°F
(20.7°C)
69.8°F
(21.0°C)
-0.6°F
(-0.3°C)
42nd Coolest Coolest since: 2014 1967
85th Warmest Warmest since: 2019 1936
Ties: 1923, 1934, 1943, 1969, 2006, 2011, 2012, 2014
Jul–Sep 2020
3-Month
71.9°F
(22.2°C)
71.7°F
(22.1°C)
0.2°F
(0.1°C)
70th Coolest Coolest since: 2017 1967
57th Warmest Warmest since: 2019 1936
Ties: 1940
Jun–Sep 2020
4-Month
72.4°F
(22.4°C)
71.7°F
(22.1°C)
0.7°F
(0.3°C)
83rd Coolest Coolest since: 2017 1915, 1924
44th Warmest Warmest since: 2019 1936
Ties: 1947, 1973, 1986
May–Sep 2020
5-Month
70.0°F
(21.1°C)
69.7°F
(20.9°C)
0.3°F
(0.2°C)
71st Coolest Coolest since: 2017 1924
56th Warmest Warmest since: 2019 1936
Ties: 1943, 1949, 2013, 2017
Apr–Sep 2020
6-Month
66.6°F
(19.2°C)
66.7°F
(19.3°C)
-0.1°F
(-0.1°C)
51st Coolest Coolest since: 2014 1907
76th Warmest Warmest since: 2019 2010
Ties: 1905, 1916, 1943, 1971, 1973, 1981
Mar–Sep 2020
7-Month
63.4°F
(17.4°C)
62.8°F
(17.1°C)
0.6°F
(0.3°C)
76th Coolest Coolest since: 2014 1924
51st Warmest Warmest since: 2019 2012
Ties: 1905, 1942, 1983
Feb–Sep 2020
8-Month
59.5°F
(15.3°C)
58.7°F
(14.8°C)
0.8°F
(0.5°C)
87th Coolest Coolest since: 2019 1904
40th Warmest Warmest since: 2018 2012
Ties: 1939, 1990
Jan–Sep 2020
9-Month
56.4°F
(13.6°C)
54.9°F
(12.7°C)
1.5°F
(0.9°C)
100th Coolest Coolest since: 2019 1904, 1912
27th Warmest Warmest since: 2017 2012
Ties: 1919, 1932, 1952
Dec 2019–Sep 2020
10-Month
54.3°F
(12.4°C)
52.4°F
(11.3°C)
1.9°F
(1.1°C)
107th Coolest Coolest since: 2019 1904
19th Warmest Warmest since: 2017 2012
Ties: 1931, 1934, 2006
Nov 2019–Sep 2020
11-Month
52.7°F
(11.5°C)
51.4°F
(10.8°C)
1.3°F
(0.7°C)
97th Coolest Coolest since: 2019 1904
29th Warmest Warmest since: 2017 2012
Oct 2019–Sep 2020
12-Month
52.8°F
(11.6°C)
51.7°F
(10.9°C)
1.1°F
(0.7°C)
96th Coolest Coolest since: 2019 1904
30th Warmest Warmest since: 2018 2012
Ties: 1942, 1976
Apr 2019–Sep 2020
18-Month
57.8°F
(14.3°C)
56.6°F
(13.7°C)
1.2°F
(0.6°C)
99th Coolest Coolest since: 2019 1904, 1918
27th Warmest Warmest since: 2018 2012
Ties: 1992, 2013
Oct 2018–Sep 2020
24-Month
52.4°F
(11.3°C)
51.6°F
(10.9°C)
0.8°F
(0.4°C)
91st Coolest Coolest since: 2015 1979
34th Warmest Warmest since: 2019 2017
Ties: 1998
Oct 2017–Sep 2020
36-Month
52.6°F
(11.4°C)
51.6°F
(10.9°C)
1.0°F
(0.5°C)
98th Coolest Coolest since: 2016 1979
26th Warmest Warmest since: 2019 2018
Ties: 1922, 2005
Oct 2016–Sep 2020
48-Month
53.2°F
(11.8°C)
51.6°F
(10.9°C)
1.6°F
(0.9°C)
114th Coolest Coolest since: 2017 1905
9th Warmest Warmest since: 2019 2019
Oct 2015–Sep 2020
60-Month
53.6°F
(12.0°C)
51.6°F
(10.9°C)
2.0°F
(1.1°C)
121st Coolest Coolest since: 2019 1906
1st Warmest Warmest to Date 2020

Citing This Page

  • NOAA National Centers for Environmental information, Climate at a Glance: Statewide Time Series, published June 2021, retrieved on June 13, 2021 from https://www.ncdc.noaa.gov/cag/