Divisional Rankings

Divisional 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, Climate Division 8. Southwest

Average Temperature Rankings, April 2015

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2023)		Warmest/Coolest
Since		Record
April 2015
1-Month		58.4°F
(14.7°C)		55.3°F
(12.9°C)		3.1°F
(1.8°C)		103rd Coolest
Coolest since:
1907
27th Warmest
Warmest since:
1896
Mar–Apr 2015
2-Month		51.0°F
(10.6°C)		50.0°F
(10.0°C)		1.0°F
(0.6°C)		79th Coolest
Coolest since:
1960
51st Warmest
Warmest since:
2012
Ties: 1918, 1930
Feb–Apr 2015
3-Month		42.7°F
(5.9°C)		44.9°F
(7.2°C)		-2.2°F
(-1.3°C)		24th Coolest
Coolest since:
1899
106th Warmest
Warmest since:
2012
Ties: 1916, 1996
Jan–Apr 2015
4-Month		40.0°F
(4.4°C)		41.5°F
(5.3°C)		-1.5°F
(-0.9°C)		30th Coolest
Coolest since:
1978
100th Warmest
Warmest since:
2012
Ties: 1900, 1968, 1977
Dec 2014–Apr 2015
5-Month		39.6°F
(4.2°C)		40.1°F
(4.5°C)		-0.5°F
(-0.3°C)		44th Coolest
Coolest since:
1978
85th Warmest
Warmest since:
2012
Ties: 1956, 1971
Nov 2014–Apr 2015
6-Month		39.4°F
(4.1°C)		40.9°F
(4.9°C)		-1.5°F
(-0.8°C)		26th Coolest
Coolest since:
1912
103rd Warmest
Warmest since:
2012
Oct 2014–Apr 2015
7-Month		42.1°F
(5.6°C)		43.2°F
(6.2°C)		-1.1°F
(-0.6°C)		26th Coolest
Coolest since:
1899, 1978
103rd Warmest
Warmest since:
2012
Ties: 1906, 1963, 1993
Sep 2014–Apr 2015
8-Month		45.3°F
(7.4°C)		46.5°F
(8.1°C)		-1.2°F
(-0.7°C)		27th Coolest
Coolest since:
1918
102nd Warmest
Warmest since:
2017
Aug 2014–Apr 2015
9-Month		48.8°F
(9.3°C)		49.8°F
(9.9°C)		-1.0°F
(-0.6°C)		29th Coolest
Coolest since:
1918
100th Warmest
Warmest since:
2017
Jul 2014–Apr 2015
10-Month		51.2°F
(10.7°C)		52.6°F
(11.4°C)		-1.4°F
(-0.7°C)		19th Coolest
Coolest since:
1918
110th Warmest
Warmest since:
2012
Jun 2014–Apr 2015
11-Month		53.4°F
(11.9°C)		54.5°F
(12.5°C)		-1.1°F
(-0.6°C)		20th Coolest
Coolest since:
1918
109th Warmest
Warmest since:
2012, 2017
Ties: 1960, 1963
May 2014–Apr 2015
12-Month		54.5°F
(12.5°C)		55.4°F
(13.0°C)		-0.9°F
(-0.5°C)		23rd Coolest
Coolest since:
1918
106th Warmest
Warmest since:
2012, 2017
Ties: 1920, 1926, 1984
Nov 2013–Apr 2015
18-Month		49.0°F
(9.4°C)		50.5°F
(10.3°C)		-1.5°F
(-0.9°C)		7th Coolest
Coolest since:
1905, 1979
121st Warmest
Warmest since:
2017
Ties: 1900, 1970
May 2013–Apr 2015
24-Month		54.2°F
(12.3°C)		55.4°F
(13.0°C)		-1.2°F
(-0.7°C)		9th Coolest
Coolest since:
1978
119th Warmest
Warmest since:
2017
Ties: 1900, 1912, 1952
May 2012–Apr 2015
36-Month		55.0°F
(12.8°C)		55.4°F
(13.0°C)		-0.4°F
(-0.2°C)		33rd Coolest
Coolest since:
1979
94th Warmest
Warmest since:
2018
Ties: 1908, 1914, 1928, 1953, 1995, 1998
May 2011–Apr 2015
48-Month		56.1°F
(13.4°C)		55.3°F
(12.9°C)		0.8°F
(0.5°C)		95th Coolest
Coolest since:
1980
31st Warmest
Warmest since:
2019
Ties: 1923, 1932, 1937, 1938, 1945, 1989, 2011
May 2010–Apr 2015
60-Month		56.2°F
(13.4°C)		55.3°F
(12.9°C)		0.9°F
(0.5°C)		97th Coolest
Coolest since:
1980, 1981
28th Warmest
Warmest since:
2020
Ties: 1938, 1939, 1942, 1958

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