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, October 2015

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
October 2015
1-Month		56.0°F
(13.3°C)		54.6°F
(12.6°C)		1.4°F
(0.7°C)		89th Coolest
Coolest since:
1925
40th Warmest
Warmest since:
1963
Sep–Oct 2015
2-Month		63.2°F
(17.3°C)		60.5°F
(15.8°C)		2.7°F
(1.5°C)		111th Coolest
Coolest since:
1917
18th Warmest
Warmest since:
1897
Ties: 2005
Aug–Oct 2015
3-Month		66.1°F
(18.9°C)		64.8°F
(18.2°C)		1.3°F
(0.7°C)		101st Coolest
Coolest since:
1917
28th Warmest
Warmest since:
1947
Ties: 1899, 1919
Jul–Oct 2015
4-Month		68.1°F
(20.1°C)		67.5°F
(19.7°C)		0.6°F
(0.4°C)		82nd Coolest
Coolest since:
1917
47th Warmest
Warmest since:
1936
Ties: 1959
Jun–Oct 2015
5-Month		68.8°F
(20.4°C)		68.2°F
(20.1°C)		0.6°F
(0.3°C)		79th Coolest
Coolest since:
1917
50th Warmest
Warmest since:
1936
May–Oct 2015
6-Month		68.2°F
(20.1°C)		67.2°F
(19.6°C)		1.0°F
(0.5°C)		95th Coolest
Coolest since:
1917
34th Warmest
Warmest since:
1936
Ties: 1919, 1963, 2019
Apr–Oct 2015
7-Month		66.2°F
(19.0°C)		65.0°F
(18.3°C)		1.2°F
(0.7°C)		102nd Coolest
Coolest since:
1917
27th Warmest
Warmest since:
2010
Ties: 1959
Mar–Oct 2015
8-Month		62.7°F
(17.1°C)		61.8°F
(16.6°C)		0.9°F
(0.5°C)		91st Coolest
Coolest since:
1917
38th Warmest
Warmest since:
2012
Ties: 1930, 2022
Feb–Oct 2015
9-Month		57.9°F
(14.4°C)		58.2°F
(14.6°C)		-0.3°F
(-0.2°C)		50th Coolest
Coolest since:
1917
79th Warmest
Warmest since:
2012
Ties: 1943, 1961
Jan–Oct 2015
10-Month		54.7°F
(12.6°C)		54.9°F
(12.7°C)		-0.2°F
(-0.1°C)		54th Coolest
Coolest since:
1904
75th Warmest
Warmest since:
2012
Ties: 1906, 1943, 1957, 1974
Dec 2014–Oct 2015
11-Month		52.8°F
(11.6°C)		52.6°F
(11.4°C)		0.2°F
(0.2°C)		72nd Coolest
Coolest since:
1904
56th Warmest
Warmest since:
2012
Ties: 1925, 1957, 1971, 1981, 1985
Nov 2014–Oct 2015
12-Month		51.3°F
(10.7°C)		51.6°F
(10.9°C)		-0.3°F
(-0.2°C)		46th Coolest
Coolest since:
1904
82nd Warmest
Warmest since:
2012
Ties: 1909, 1927, 1943, 2008
May 2014–Oct 2015
18-Month		56.4°F
(13.6°C)		56.8°F
(13.8°C)		-0.4°F
(-0.2°C)		37th Coolest
Coolest since:
1904
91st Warmest
Warmest since:
2012
Ties: 1903, 1952, 1961
Nov 2013–Oct 2015
24-Month		50.2°F
(10.1°C)		51.6°F
(10.9°C)		-1.4°F
(-0.8°C)		6th Coolest
Coolest since:
1905
121st Warmest
Warmest since:
2017
Ties: 1917
Nov 2012–Oct 2015
36-Month		50.9°F
(10.5°C)		51.6°F
(10.9°C)		-0.7°F
(-0.4°C)		17th Coolest
Coolest since:
1904, 1979
109th Warmest
Warmest since:
2018
Ties: 1926, 1969
Nov 2011–Oct 2015
48-Month		52.2°F
(11.2°C)		51.6°F
(10.9°C)		0.6°F
(0.3°C)		86th Coolest
Coolest since:
1905
39th Warmest
Warmest since:
2019
Ties: 1923, 1939, 1944
Nov 2010–Oct 2015
60-Month		52.1°F
(11.2°C)		51.6°F
(10.9°C)		0.5°F
(0.3°C)		78th Coolest
Coolest since:
1905, 1906
46th Warmest
Warmest since:
2002, 2020
Ties: 1937, 1943, 1988, 1993

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