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 2. Northeast

Average Temperature Rankings, September 2020

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Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
September 2020
1-Month 		63.6°F
(17.6°C)		 63.7°F
(17.6°C)		 -0.1°F
(0.0°C)		 57th Coolest
Coolest since:
 1918
72nd Warmest
Warmest since:
 1897
Ties: 1935
Aug–Sep 2020
2-Month 		68.1°F
(20.1°C)		 67.4°F
(19.7°C)		 0.7°F
(0.4°C)		 76th Coolest
Coolest since:
 1902
53rd Warmest
Warmest since:
 1947
Ties: 1899, 1916, 1970
Jul–Sep 2020
3-Month 		70.8°F
(21.6°C)		 69.3°F
(20.7°C)		 1.5°F
(0.9°C)		 99th Coolest
Coolest since:
 1924
30th Warmest
Warmest since:
 1936
Jun–Sep 2020
4-Month 		71.0°F
(21.7°C)		 69.2°F
(20.7°C)		 1.8°F
(1.0°C)		 109th Coolest
Coolest since:
 1915
20th Warmest
Warmest since:
 2005
Ties: 1955, 1987
May–Sep 2020
5-Month 		68.5°F
(20.3°C)		 67.1°F
(19.5°C)		 1.4°F
(0.8°C)		 99th Coolest
Coolest since:
 1924
30th Warmest
Warmest since:
 1921, 1988
Ties: 1977, 1999, 2002
Apr–Sep 2020
6-Month 		64.8°F
(18.2°C)		 63.9°F
(17.7°C)		 0.9°F
(0.5°C)		 83rd Coolest
Coolest since:
 1907
46th Warmest
Warmest since:
 1921
Ties: 1952, 1995, 2022
Mar–Sep 2020
7-Month 		61.3°F
(16.3°C)		 59.9°F
(15.5°C)		 1.4°F
(0.8°C)		 106th Coolest
Coolest since:
 1924
23rd Warmest
Warmest since:
 2012
Ties: 1973
Feb–Sep 2020
8-Month 		57.2°F
(14.0°C)		 55.5°F
(13.1°C)		 1.7°F
(0.9°C)		 110th Coolest
Coolest since:
 1904, 1917
19th Warmest
Warmest since:
 2012
Ties: 1911, 2002, 2021
Jan–Sep 2020
9-Month 		54.0°F
(12.2°C)		 51.7°F
(10.9°C)		 2.3°F
(1.3°C)		 116th Coolest
Coolest since:
 1904, 1912
13th Warmest
Warmest since:
 2012
Ties: 1933, 1990, 2000
Dec 2019–Sep 2020
10-Month 		51.9°F
(11.1°C)		 49.1°F
(9.5°C)		 2.8°F
(1.6°C)		 119th Coolest
Coolest since:
 1904
9th Warmest
Warmest since:
 2012
Ties: 1983
Nov 2019–Sep 2020
11-Month 		50.2°F
(10.1°C)		 48.1°F
(8.9°C)		 2.1°F
(1.2°C)		 108th Coolest
Coolest since:
 1904
20th Warmest
Warmest since:
 2012
Ties: 1931
Oct 2019–Sep 2020
12-Month 		50.3°F
(10.2°C)		 48.5°F
(9.2°C)		 1.8°F
(1.0°C)		 107th Coolest
Coolest since:
 1904
21st Warmest
Warmest since:
 2012
Ties: 2022
Apr 2019–Sep 2020
18-Month 		55.1°F
(12.8°C)		 53.6°F
(12.0°C)		 1.5°F
(0.8°C)		 107th Coolest
Coolest since:
 1904
21st Warmest
Warmest since:
 2012
Ties: 1931, 1955
Oct 2018–Sep 2020
24-Month 		49.4°F
(9.7°C)		 48.5°F
(9.2°C)		 0.9°F
(0.5°C)		 95th Coolest
Coolest since:
 1918
32nd Warmest
Warmest since:
 2017
Oct 2017–Sep 2020
36-Month 		49.5°F
(9.7°C)		 48.4°F
(9.1°C)		 1.1°F
(0.6°C)		 97th Coolest
Coolest since:
 1979
29th Warmest
Warmest since:
 2000
Ties: 1922, 1991, 2003, 2014
Oct 2016–Sep 2020
48-Month 		50.0°F
(10.0°C)		 48.4°F
(9.1°C)		 1.6°F
(0.9°C)		 114th Coolest
Coolest since:
 1905, 1918
11th Warmest
Warmest since:
 2001, 2002, 2019
Ties: 1934, 2022
Oct 2015–Sep 2020
60-Month 		50.5°F
(10.3°C)		 48.4°F
(9.1°C)		 2.1°F
(1.2°C)		 122nd Coolest
Coolest since:
 1905, 1906
2nd Warmest
Warmest since:
 2002

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