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 1921

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PeriodValue1901-2000
Mean		AnomalyRank
(1895-2023)		Warmest/Coolest
Since		Record
April 1921
1-Month		56.1°F
(13.4°C)		55.3°F
(12.9°C)		0.8°F
(0.5°C)		73rd Coolest
Coolest since:
1907
57th Warmest
Warmest since:
1896
Ties: 1934
Mar–Apr 1921
2-Month		54.7°F
(12.6°C)		50.0°F
(10.0°C)		4.7°F
(2.6°C)		122nd Coolest
Coolest since:
1960
8th Warmest
Warmest since:
2012
Ties: 2016
Feb–Apr 1921
3-Month		49.7°F
(9.8°C)		44.9°F
(7.2°C)		4.8°F
(2.6°C)		123rd Coolest
Coolest since:
1899
7th Warmest
Warmest to Date
2012
Jan–Apr 1921
4-Month		46.6°F
(8.1°C)		41.5°F
(5.3°C)		5.1°F
(2.8°C)		126th Coolest
Coolest since:
1978
4th Warmest
Warmest to Date
2012
Dec 1920–Apr 1921
5-Month		44.5°F
(6.9°C)		40.1°F
(4.5°C)		4.4°F
(2.4°C)		125th Coolest
Coolest since:
1978
4th Warmest
Warmest to Date
2012
Nov 1920–Apr 1921
6-Month		44.0°F
(6.7°C)		40.9°F
(4.9°C)		3.1°F
(1.8°C)		119th Coolest
Coolest since:
1912
10th Warmest
Warmest to Date
2012
Oct 1920–Apr 1921
7-Month		46.5°F
(8.1°C)		43.2°F
(6.2°C)		3.3°F
(1.9°C)		123rd Coolest
Coolest since:
1899, 1978
6th Warmest
Warmest to Date
2012
Sep 1920–Apr 1921
8-Month		49.5°F
(9.7°C)		46.5°F
(8.1°C)		3.0°F
(1.6°C)		121st Coolest
Coolest since:
1918
8th Warmest
Warmest to Date
2017
Aug 1920–Apr 1921
9-Month		52.1°F
(11.2°C)		49.8°F
(9.9°C)		2.3°F
(1.3°C)		121st Coolest
Coolest since:
1918
8th Warmest
Warmest to Date
2017
Ties: 1954, 2002
Jul 1920–Apr 1921
10-Month		54.6°F
(12.6°C)		52.6°F
(11.4°C)		2.0°F
(1.2°C)		118th Coolest
Coolest since:
1918
11th Warmest
Warmest to Date
2012
Ties: 1939, 2023
Jun 1920–Apr 1921
11-Month		56.2°F
(13.4°C)		54.5°F
(12.5°C)		1.7°F
(0.9°C)		114th Coolest
Coolest since:
1918
15th Warmest
Warmest to Date
2012, 2017
Ties: 1939, 1974, 2020, 2022
May 1920–Apr 1921
12-Month		56.8°F
(13.8°C)		55.4°F
(13.0°C)		1.4°F
(0.8°C)		107th Coolest
Coolest since:
1918
22nd Warmest
Warmest since:
2012, 2017
Ties: 1919, 1922, 1981, 2011
Nov 1919–Apr 1921
18-Month		50.7°F
(10.4°C)		50.5°F
(10.3°C)		0.2°F
(0.1°C)		66th Coolest
Coolest since:
1905, 1979
62nd Warmest
Warmest since:
2017
Ties: 1920, 1966, 1996
May 1919–Apr 1921
24-Month		55.7°F
(13.2°C)		55.4°F
(13.0°C)		0.3°F
(0.2°C)		78th Coolest
Coolest since:
1978
50th Warmest
Warmest since:
2017
Ties: 1898, 1920, 1950, 1967, 1973, 1990, 1993
May 1918–Apr 1921
36-Month		56.1°F
(13.4°C)		55.4°F
(13.0°C)		0.7°F
(0.4°C)		95th Coolest
Coolest since:
1979
32nd Warmest
Warmest to Date
2018
Ties: 1943, 1988, 2005
May 1917–Apr 1921
48-Month		55.0°F
(12.8°C)		55.3°F
(12.9°C)		-0.3°F
(-0.1°C)		30th Coolest
Coolest since:
1980
96th Warmest
Warmest since:
2019
Ties: 1900, 1912, 1930, 1952, 1968, 1977, 1983
May 1916–Apr 1921
60-Month		55.0°F
(12.8°C)		55.3°F
(12.9°C)		-0.3°F
(-0.1°C)		31st Coolest
Coolest since:
1980, 1981
94th Warmest
Warmest since:
2020
Ties: 1900, 1913, 1914, 1929, 1961, 1977, 1986

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