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 1941

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 1941
1-Month		69.1°F
(20.6°C)		66.2°F
(19.0°C)		2.9°F
(1.6°C)		103rd Coolest
Coolest since:
1918
26th Warmest
Warmest since:
1925, 1933
Ties: 1922
Aug–Sep 1941
2-Month		72.2°F
(22.3°C)		69.8°F
(21.0°C)		2.4°F
(1.3°C)		108th Coolest
Coolest since:
1967
21st Warmest
Warmest since:
1936
Ties: 2002, 2019
Jul–Sep 1941
3-Month		73.5°F
(23.1°C)		71.7°F
(22.1°C)		1.8°F
(1.0°C)		104th Coolest
Coolest since:
1967
25th Warmest
Warmest since:
1936
Jun–Sep 1941
4-Month		73.3°F
(22.9°C)		71.7°F
(22.1°C)		1.6°F
(0.8°C)		106th Coolest
Coolest since:
1915, 1924
23rd Warmest
Warmest since:
1936
Ties: 1930
May–Sep 1941
5-Month		71.8°F
(22.1°C)		69.7°F
(20.9°C)		2.1°F
(1.2°C)		115th Coolest
Coolest since:
1924
14th Warmest
Warmest since:
1936
Ties: 1959, 2016
Apr–Sep 1941
6-Month		69.2°F
(20.7°C)		66.7°F
(19.3°C)		2.5°F
(1.4°C)		122nd Coolest
Coolest since:
1907
7th Warmest
Warmest since:
2010
Mar–Sep 1941
7-Month		64.3°F
(17.9°C)		62.9°F
(17.2°C)		1.4°F
(0.7°C)		108th Coolest
Coolest since:
1924
21st Warmest
Warmest since:
2012
Ties: 1911, 1922, 1954
Feb–Sep 1941
8-Month		59.6°F
(15.3°C)		58.7°F
(14.8°C)		0.9°F
(0.5°C)		91st Coolest
Coolest since:
1904
38th Warmest
Warmest since:
2012
Ties: 1976
Jan–Sep 1941
9-Month		56.2°F
(13.4°C)		54.9°F
(12.7°C)		1.3°F
(0.7°C)		94th Coolest
Coolest since:
1904, 1912
35th Warmest
Warmest since:
2012
Ties: 1964, 1973, 2018
Dec 1940–Sep 1941
10-Month		54.0°F
(12.2°C)		52.4°F
(11.3°C)		1.6°F
(0.9°C)		103rd Coolest
Coolest since:
1904
25th Warmest
Warmest since:
2012
Ties: 2010
Nov 1940–Sep 1941
11-Month		52.5°F
(11.4°C)		51.4°F
(10.8°C)		1.1°F
(0.6°C)		95th Coolest
Coolest since:
1904
33rd Warmest
Warmest since:
2012
Ties: 1925, 1976, 2004, 2018
Oct 1940–Sep 1941
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, 1953, 2021
Apr 1940–Sep 1941
18-Month		57.4°F
(14.1°C)		56.7°F
(13.7°C)		0.7°F
(0.4°C)		89th Coolest
Coolest since:
1904, 1918
39th Warmest
Warmest since:
2012
Ties: 1938, 2008
Oct 1939–Sep 1941
24-Month		51.8°F
(11.0°C)		51.6°F
(10.9°C)		0.2°F
(0.1°C)		73rd Coolest
Coolest since:
1979
54th Warmest
Warmest since:
2017
Ties: 1898, 1948, 1950, 1965, 1972, 1989, 2004
Oct 1938–Sep 1941
36-Month		52.3°F
(11.3°C)		51.6°F
(10.9°C)		0.7°F
(0.4°C)		88th Coolest
Coolest since:
1979
38th Warmest
Warmest since:
2018
Ties: 2003
Oct 1937–Sep 1941
48-Month		52.4°F
(11.3°C)		51.6°F
(10.9°C)		0.8°F
(0.4°C)		97th Coolest
Coolest since:
1905
28th Warmest
Warmest since:
2019
Ties: 1942, 1989, 1990, 2004, 2010, 2014
Oct 1936–Sep 1941
60-Month		52.2°F
(11.2°C)		51.6°F
(10.9°C)		0.6°F
(0.3°C)		83rd Coolest
Coolest since:
1906
41st Warmest
Warmest since:
2020
Ties: 1939, 1943, 1988, 1995

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