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 2009

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 2009
1-Month		65.9°F
(18.8°C)		66.2°F
(19.0°C)		-0.3°F
(-0.2°C)		56th Coolest
Coolest since:
1918
73rd Warmest
Warmest since:
1925, 1933
Ties: 1910, 1965
Aug–Sep 2009
2-Month		68.4°F
(20.2°C)		69.8°F
(21.0°C)		-1.4°F
(-0.8°C)		27th Coolest
Coolest since:
1967
102nd Warmest
Warmest since:
1936
Ties: 1907, 1918, 1942
Jul–Sep 2009
3-Month		69.0°F
(20.6°C)		71.7°F
(22.1°C)		-2.7°F
(-1.5°C)		6th Coolest
Coolest since:
1967
123rd Warmest
Warmest since:
1936
Jun–Sep 2009
4-Month		70.0°F
(21.1°C)		71.7°F
(22.1°C)		-1.7°F
(-1.0°C)		19th Coolest
Coolest since:
1915, 1924
110th Warmest
Warmest since:
1936
May–Sep 2009
5-Month		68.5°F
(20.3°C)		69.7°F
(20.9°C)		-1.2°F
(-0.6°C)		23rd Coolest
Coolest since:
1924
106th Warmest
Warmest since:
1936
Ties: 1902, 1981
Apr–Sep 2009
6-Month		65.7°F
(18.7°C)		66.7°F
(19.3°C)		-1.0°F
(-0.6°C)		28th Coolest
Coolest since:
1907
101st Warmest
Warmest since:
2010
Ties: 1918, 1926, 1958, 1979
Mar–Sep 2009
7-Month		62.5°F
(16.9°C)		62.9°F
(17.2°C)		-0.4°F
(-0.3°C)		46th Coolest
Coolest since:
1924
83rd Warmest
Warmest since:
2012
Ties: 1897, 1903, 1935, 1937, 1978
Feb–Sep 2009
8-Month		58.8°F
(14.9°C)		58.7°F
(14.8°C)		0.1°F
(0.1°C)		68th Coolest
Coolest since:
1904
61st Warmest
Warmest since:
2012
Ties: 1927, 1945, 1985
Jan–Sep 2009
9-Month		54.5°F
(12.5°C)		54.9°F
(12.7°C)		-0.4°F
(-0.2°C)		48th Coolest
Coolest since:
1904, 1912
81st Warmest
Warmest since:
2012
Ties: 1916, 1989, 2015
Dec 2008–Sep 2009
10-Month		51.8°F
(11.0°C)		52.4°F
(11.3°C)		-0.6°F
(-0.3°C)		38th Coolest
Coolest since:
1904
90th Warmest
Warmest since:
2012
Ties: 1993, 2001
Nov 2008–Sep 2009
11-Month		50.8°F
(10.4°C)		51.4°F
(10.8°C)		-0.6°F
(-0.4°C)		36th Coolest
Coolest since:
1904
92nd Warmest
Warmest since:
2012
Ties: 1945, 1950, 1968, 1993, 2003, 2015
Oct 2008–Sep 2009
12-Month		51.1°F
(10.6°C)		51.6°F
(10.9°C)		-0.5°F
(-0.3°C)		38th Coolest
Coolest since:
1904
90th Warmest
Warmest since:
2012
Ties: 1945, 1961, 1965, 2015
Apr 2008–Sep 2009
18-Month		56.1°F
(13.4°C)		56.7°F
(13.7°C)		-0.6°F
(-0.3°C)		36th Coolest
Coolest since:
1904, 1918
92nd Warmest
Warmest since:
2012
Ties: 1903, 1916
Oct 2007–Sep 2009
24-Month		51.4°F
(10.8°C)		51.6°F
(10.9°C)		-0.2°F
(-0.1°C)		44th Coolest
Coolest since:
1979
83rd Warmest
Warmest since:
2017
Ties: 1897, 1925, 1926, 1958
Oct 2006–Sep 2009
36-Month		52.1°F
(11.2°C)		51.6°F
(10.9°C)		0.5°F
(0.3°C)		85th Coolest
Coolest since:
1979
41st Warmest
Warmest since:
2018
Ties: 1936, 1942, 1944, 2011
Oct 2005–Sep 2009
48-Month		52.5°F
(11.4°C)		51.6°F
(10.9°C)		0.9°F
(0.5°C)		99th Coolest
Coolest since:
1905
26th Warmest
Warmest since:
2019
Ties: 1991
Oct 2004–Sep 2009
60-Month		52.8°F
(11.6°C)		51.6°F
(10.9°C)		1.2°F
(0.7°C)		111th Coolest
Coolest since:
1906
13th Warmest
Warmest since:
2020
Ties: 1957, 1991, 2016, 2022

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