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 3. West

Average Temperature Rankings, April 2021

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
April 2021
1-Month 		51.7°F
(10.9°C)		 51.3°F
(10.7°C)		 0.4°F
(0.2°C)		 61st Coolest
Coolest since:
 2018
68th Warmest
Warmest since:
 2010
Ties: 2011
Mar–Apr 2021
2-Month 		48.7°F
(9.3°C)		 45.2°F
(7.3°C)		 3.5°F
(2.0°C)		 106th Coolest
Coolest since:
 1960
23rd Warmest
Warmest since:
 2012
Feb–Apr 2021
3-Month 		38.5°F
(3.6°C)		 39.5°F
(4.2°C)		 -1.0°F
(-0.6°C)		 44th Coolest
Coolest since:
 1899
85th Warmest
Warmest since:
 2012
Jan–Apr 2021
4-Month 		35.9°F
(2.2°C)		 35.6°F
(2.0°C)		 0.3°F
(0.2°C)		 70th Coolest
Coolest since:
 1912
59th Warmest
Warmest since:
 2012
Ties: 1957, 2010
Dec 2020–Apr 2021
5-Month 		35.0°F
(1.7°C)		 34.2°F
(1.2°C)		 0.8°F
(0.5°C)		 82nd Coolest
Coolest since:
 1978
46th Warmest
Warmest since:
 2012
Ties: 1907, 1952, 1957, 1966
Nov 2020–Apr 2021
6-Month 		36.9°F
(2.7°C)		 35.2°F
(1.8°C)		 1.7°F
(0.9°C)		 97th Coolest
Coolest since:
 1904, 1912, 1978
31st Warmest
Warmest since:
 2012
Ties: 1990
Oct 2020–Apr 2021
7-Month 		38.9°F
(3.8°C)		 37.9°F
(3.3°C)		 1.0°F
(0.5°C)		 89th Coolest
Coolest since:
 1912
39th Warmest
Warmest since:
 2012
Ties: 1928, 1966, 1985
Sep 2020–Apr 2021
8-Month 		42.1°F
(5.6°C)		 41.5°F
(5.3°C)		 0.6°F
(0.3°C)		 80th Coolest
Coolest since:
 1904, 1978
48th Warmest
Warmest since:
 2017
Ties: 1923, 1949, 1953
Aug 2020–Apr 2021
9-Month 		45.5°F
(7.5°C)		 45.0°F
(7.2°C)		 0.5°F
(0.3°C)		 73rd Coolest
Coolest since:
 1978
55th Warmest
Warmest since:
 2017
Ties: 1896, 1910, 1937, 1953, 1966
Jul 2020–Apr 2021
10-Month 		48.6°F
(9.2°C)		 48.1°F
(8.9°C)		 0.5°F
(0.3°C)		 81st Coolest
Coolest since:
 1904
47th Warmest
Warmest since:
 2012
Ties: 1901, 1909, 1923, 1949, 1953
Jun 2020–Apr 2021
11-Month 		50.9°F
(10.5°C)		 50.3°F
(10.2°C)		 0.6°F
(0.3°C)		 84th Coolest
Coolest since:
 1904
44th Warmest
Warmest since:
 2017
Ties: 1972, 1990, 2011
May 2020–Apr 2021
12-Month 		51.7°F
(10.9°C)		 51.3°F
(10.7°C)		 0.4°F
(0.2°C)		 75th Coolest
Coolest since:
 1918
53rd Warmest
Warmest since:
 2017
Ties: 1896, 1948
Nov 2019–Apr 2021
18-Month 		46.8°F
(8.2°C)		 45.9°F
(7.7°C)		 0.9°F
(0.5°C)		 94th Coolest
Coolest since:
 1979
33rd Warmest
Warmest since:
 2017
May 2019–Apr 2021
24-Month 		52.0°F
(11.1°C)		 51.2°F
(10.7°C)		 0.8°F
(0.4°C)		 96th Coolest
Coolest since:
 1905
31st Warmest
Warmest since:
 2017
Ties: 1940, 1956, 1990, 2002, 2016, 2022
May 2018–Apr 2021
36-Month 		52.0°F
(11.1°C)		 51.2°F
(10.7°C)		 0.8°F
(0.4°C)		 92nd Coolest
Coolest since:
 1979
34th Warmest
Warmest since:
 2018
Ties: 1924, 1941
May 2017–Apr 2021
48-Month 		51.7°F
(10.9°C)		 51.2°F
(10.7°C)		 0.5°F
(0.2°C)		 82nd Coolest
Coolest since:
 1980
43rd Warmest
Warmest since:
 1935
Ties: 1916, 1925, 1936, 1939
May 2016–Apr 2021
60-Month 		52.4°F
(11.3°C)		 51.2°F
(10.7°C)		 1.2°F
(0.6°C)		 115th Coolest
Coolest since:
 1906, 1979
9th Warmest
Warmest since:
 1935
Ties: 1942, 1992, 2019

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