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 2021

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2023)		Warmest/Coolest
Since		Record
April 2021
1-Month		55.5°F
(13.1°C)		55.3°F
(12.9°C)		0.2°F
(0.2°C)		65th Coolest
Coolest since:
1907
65th Warmest
Warmest since:
1896
Mar–Apr 2021
2-Month		53.2°F
(11.8°C)		50.0°F
(10.0°C)		3.2°F
(1.8°C)		107th Coolest
Coolest since:
1960
23rd Warmest
Warmest since:
2012
Ties: 1955
Feb–Apr 2021
3-Month		44.3°F
(6.8°C)		44.9°F
(7.2°C)		-0.6°F
(-0.4°C)		53rd Coolest
Coolest since:
1899
77th Warmest
Warmest since:
2012
Jan–Apr 2021
4-Month		41.9°F
(5.5°C)		41.5°F
(5.3°C)		0.4°F
(0.2°C)		69th Coolest
Coolest since:
1978
61st Warmest
Warmest since:
2012
Dec 2020–Apr 2021
5-Month		40.9°F
(4.9°C)		40.1°F
(4.5°C)		0.8°F
(0.4°C)		75th Coolest
Coolest since:
1978
54th Warmest
Warmest since:
2012
Ties: 1931, 1986
Nov 2020–Apr 2021
6-Month		42.5°F
(5.8°C)		40.9°F
(4.9°C)		1.6°F
(0.9°C)		99th Coolest
Coolest since:
1912
30th Warmest
Warmest since:
2012
Ties: 1972, 2022
Oct 2020–Apr 2021
7-Month		44.3°F
(6.8°C)		43.2°F
(6.2°C)		1.1°F
(0.6°C)		92nd Coolest
Coolest since:
1899, 1978
37th Warmest
Warmest since:
2012
Ties: 1953
Sep 2020–Apr 2021
8-Month		47.4°F
(8.6°C)		46.5°F
(8.1°C)		0.9°F
(0.5°C)		89th Coolest
Coolest since:
1918
40th Warmest
Warmest since:
2017
Ties: 1923, 2007, 2019
Aug 2020–Apr 2021
9-Month		50.4°F
(10.2°C)		49.8°F
(9.9°C)		0.6°F
(0.3°C)		82nd Coolest
Coolest since:
1918
47th Warmest
Warmest since:
2017
Ties: 1907, 1927, 1937, 1941, 1953, 1990
Jul 2020–Apr 2021
10-Month		53.3°F
(11.8°C)		52.6°F
(11.4°C)		0.7°F
(0.4°C)		83rd Coolest
Coolest since:
1918
46th Warmest
Warmest since:
2012
Ties: 1923, 1927, 1987
Jun 2020–Apr 2021
11-Month		55.3°F
(12.9°C)		54.5°F
(12.5°C)		0.8°F
(0.4°C)		84th Coolest
Coolest since:
1918
45th Warmest
Warmest since:
2012, 2017
May 2020–Apr 2021
12-Month		56.0°F
(13.3°C)		55.4°F
(13.0°C)		0.6°F
(0.3°C)		82nd Coolest
Coolest since:
1918
47th Warmest
Warmest since:
2012, 2017
Ties: 1927, 1989
Nov 2019–Apr 2021
18-Month		51.6°F
(10.9°C)		50.5°F
(10.3°C)		1.1°F
(0.6°C)		100th Coolest
Coolest since:
1905, 1979
28th Warmest
Warmest since:
2017
Ties: 1923, 1987
May 2019–Apr 2021
24-Month		56.6°F
(13.7°C)		55.4°F
(13.0°C)		1.2°F
(0.7°C)		109th Coolest
Coolest since:
1978
19th Warmest
Warmest since:
2017
Ties: 1923, 1938, 2008
May 2018–Apr 2021
36-Month		56.7°F
(13.7°C)		55.4°F
(13.0°C)		1.3°F
(0.7°C)		110th Coolest
Coolest since:
1979
17th Warmest
Warmest since:
2018
Ties: 1923, 1939, 2022
May 2017–Apr 2021
48-Month		56.5°F
(13.6°C)		55.3°F
(12.9°C)		1.2°F
(0.7°C)		105th Coolest
Coolest since:
1980
21st Warmest
Warmest since:
2019
Ties: 2017
May 2016–Apr 2021
60-Month		57.0°F
(13.9°C)		55.3°F
(12.9°C)		1.7°F
(1.0°C)		122nd Coolest
Coolest since:
1980, 1981
3rd Warmest
Warmest since:
2020
Ties: 2019

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