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 5. East

Average Temperature Rankings, May 1991

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
May 1991
1-Month 		68.4°F
(20.2°C)		 61.0°F
(16.1°C)		 7.4°F
(4.1°C)		 126th Coolest
Coolest since:
 1907
3rd Warmest
Warmest since:
 2018
Ties: 1896
Apr–May 1991
2-Month 		61.8°F
(16.6°C)		 55.5°F
(13.1°C)		 6.3°F
(3.5°C)		 126th Coolest
Coolest since:
 1907
3rd Warmest
Warmest since:
 1977
Mar–May 1991
3-Month 		55.2°F
(12.9°C)		 49.7°F
(9.8°C)		 5.5°F
(3.1°C)		 126th Coolest
Coolest since:
 1960
3rd Warmest
Warmest since:
 2012
Feb–May 1991
4-Month 		49.5°F
(9.7°C)		 44.2°F
(6.8°C)		 5.3°F
(2.9°C)		 127th Coolest
Coolest since:
 1978
2nd Warmest
Warmest to Date
 2012
Jan–May 1991
5-Month 		44.2°F
(6.8°C)		 40.1°F
(4.5°C)		 4.1°F
(2.3°C)		 122nd Coolest
Coolest since:
 1978
7th Warmest
Warmest since:
 2012
Dec 1990–May 1991
6-Month 		41.8°F
(5.4°C)		 38.1°F
(3.4°C)		 3.7°F
(2.0°C)		 121st Coolest
Coolest since:
 1904, 1978
7th Warmest
Warmest since:
 2012
Nov 1990–May 1991
7-Month 		42.4°F
(5.8°C)		 38.3°F
(3.5°C)		 4.1°F
(2.3°C)		 122nd Coolest
Coolest since:
 1904
6th Warmest
Warmest since:
 2012
Ties: 2000
Oct 1990–May 1991
8-Month 		43.6°F
(6.4°C)		 40.2°F
(4.6°C)		 3.4°F
(1.8°C)		 120th Coolest
Coolest since:
 1904
8th Warmest
Warmest since:
 2012
Sep 1990–May 1991
9-Month 		46.1°F
(7.8°C)		 43.0°F
(6.1°C)		 3.1°F
(1.7°C)		 119th Coolest
Coolest since:
 1904
9th Warmest
Warmest since:
 2012
Aug 1990–May 1991
10-Month 		48.6°F
(9.2°C)		 45.9°F
(7.7°C)		 2.7°F
(1.5°C)		 120th Coolest
Coolest since:
 1904
8th Warmest
Warmest since:
 2012
Jul 1990–May 1991
11-Month 		50.8°F
(10.4°C)		 48.5°F
(9.2°C)		 2.3°F
(1.2°C)		 118th Coolest
Coolest since:
 1904
10th Warmest
Warmest since:
 2012
Ties: 1998
Jun 1990–May 1991
12-Month 		52.5°F
(11.4°C)		 50.3°F
(10.2°C)		 2.2°F
(1.2°C)		 117th Coolest
Coolest since:
 1904
11th Warmest
Warmest since:
 2012
Ties: 2022
Dec 1989–May 1991
18-Month 		48.2°F
(9.0°C)		 46.2°F
(7.9°C)		 2.0°F
(1.1°C)		 113th Coolest
Coolest since:
 1905
14th Warmest
Warmest since:
 2017
Ties: 2007
Jun 1989–May 1991
24-Month 		51.7°F
(10.9°C)		 50.3°F
(10.2°C)		 1.4°F
(0.7°C)		 110th Coolest
Coolest since:
 1905
17th Warmest
Warmest since:
 2017
Ties: 1935, 1942, 2021
Jun 1988–May 1991
36-Month 		51.5°F
(10.8°C)		 50.3°F
(10.2°C)		 1.2°F
(0.6°C)		 102nd Coolest
Coolest since:
 1905, 1906
24th Warmest
Warmest since:
 2018
Ties: 1987, 1993, 2021
Jun 1987–May 1991
48-Month 		51.5°F
(10.8°C)		 50.3°F
(10.2°C)		 1.2°F
(0.6°C)		 103rd Coolest
Coolest since:
 1905
22nd Warmest
Warmest since:
 2019
Ties: 1933, 1988, 2014, 2017
Jun 1986–May 1991
60-Month 		51.6°F
(10.9°C)		 50.3°F
(10.2°C)		 1.3°F
(0.7°C)		 110th Coolest
Coolest since:
 1905, 1906, 1908
14th Warmest
Warmest since:
 2020
Ties: 2001, 2004, 2009, 2022

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