Statewide Rankings

Statewide Data Info
Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Illinois

Average Temperature Rankings, September 2021

View Period (Months):
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  • Record Warmest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
September 2021
1-Month 		69.6°F
(20.9°C)		 66.2°F
(19.0°C)		 3.4°F
(1.9°C)		 110th Coolest
Coolest since:
 1918
19th Warmest
Warmest since:
 1925, 1933
Ties: 1895, 1954
Aug–Sep 2021
2-Month 		72.6°F
(22.6°C)		 69.8°F
(21.0°C)		 2.8°F
(1.6°C)		 117th Coolest
Coolest since:
 1967
12th Warmest
Warmest since:
 1936
Ties: 1906
Jul–Sep 2021
3-Month 		73.3°F
(22.9°C)		 71.8°F
(22.1°C)		 1.5°F
(0.8°C)		 102nd Coolest
Coolest since:
 1967
27th Warmest
Warmest since:
 1936
Ties: 2018
Jun–Sep 2021
4-Month 		73.5°F
(23.1°C)		 71.7°F
(22.1°C)		 1.8°F
(1.0°C)		 110th Coolest
Coolest since:
 1915, 1924
19th Warmest
Warmest since:
 1936
Ties: 1914, 2007
May–Sep 2021
5-Month 		71.0°F
(21.7°C)		 69.7°F
(20.9°C)		 1.3°F
(0.8°C)		 95th Coolest
Coolest since:
 1924
34th Warmest
Warmest since:
 1936
Ties: 2019, 2022
Apr–Sep 2021
6-Month 		67.9°F
(19.9°C)		 66.7°F
(19.3°C)		 1.2°F
(0.6°C)		 97th Coolest
Coolest since:
 1907
32nd Warmest
Warmest since:
 2010
Ties: 1944, 1980, 2015, 2019
Mar–Sep 2021
7-Month 		64.8°F
(18.2°C)		 62.8°F
(17.1°C)		 2.0°F
(1.1°C)		 117th Coolest
Coolest since:
 1924
12th Warmest
Warmest since:
 2012
Ties: 1925, 1998
Feb–Sep 2021
8-Month 		59.3°F
(15.2°C)		 58.6°F
(14.8°C)		 0.7°F
(0.4°C)		 81st Coolest
Coolest since:
 1904
48th Warmest
Warmest since:
 2012
Ties: 1896, 1995, 2004, 2019
Jan–Sep 2021
9-Month 		56.0°F
(13.3°C)		 54.9°F
(12.7°C)		 1.1°F
(0.6°C)		 89th Coolest
Coolest since:
 1904, 1912
40th Warmest
Warmest since:
 2012
Dec 2020–Sep 2021
10-Month 		53.7°F
(12.1°C)		 52.4°F
(11.3°C)		 1.3°F
(0.8°C)		 98th Coolest
Coolest since:
 1904
30th Warmest
Warmest since:
 2012
Ties: 1911, 1988
Nov 2020–Sep 2021
11-Month 		53.1°F
(11.7°C)		 51.4°F
(10.8°C)		 1.7°F
(0.9°C)		 108th Coolest
Coolest since:
 1904
20th Warmest
Warmest since:
 2012
Ties: 1931, 1955
Oct 2020–Sep 2021
12-Month 		53.0°F
(11.7°C)		 51.6°F
(10.9°C)		 1.4°F
(0.8°C)		 105th Coolest
Coolest since:
 1904
23rd Warmest
Warmest since:
 2012
Ties: 1925, 1931, 1941, 1953
Apr 2020–Sep 2021
18-Month 		57.5°F
(14.2°C)		 56.6°F
(13.7°C)		 0.9°F
(0.5°C)		 94th Coolest
Coolest since:
 1904, 1918
34th Warmest
Warmest since:
 2012
Ties: 1937, 1983, 1995, 2019
Oct 2019–Sep 2021
24-Month 		52.9°F
(11.6°C)		 51.6°F
(10.9°C)		 1.3°F
(0.7°C)		 105th Coolest
Coolest since:
 1979
22nd Warmest
Warmest since:
 2017
Ties: 1934, 1942, 2002
Oct 2018–Sep 2021
36-Month 		52.6°F
(11.4°C)		 51.6°F
(10.9°C)		 1.0°F
(0.5°C)		 99th Coolest
Coolest since:
 1979
27th Warmest
Warmest since:
 2018
Ties: 1922, 2005, 2020
Oct 2017–Sep 2021
48-Month 		52.7°F
(11.5°C)		 51.6°F
(10.9°C)		 1.1°F
(0.6°C)		 104th Coolest
Coolest since:
 1905
21st Warmest
Warmest since:
 2019
Ties: 1988, 2003, 2017
Oct 2016–Sep 2021
60-Month 		53.1°F
(11.7°C)		 51.5°F
(10.8°C)		 1.6°F
(0.9°C)		 118th Coolest
Coolest since:
 1906
6th Warmest
Warmest since:
 2020
Ties: 1934, 1935

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