Statewide Rankings

Statewide 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

Average Temperature Rankings, September 2020

View Period (Months):
Download: CSV JSON XML
  • Record Coolest
  • Bottom ⅒
  • Bottom ⅓
  • Normal
  • Top ⅓
  • Top ⅒
  • Record Warmest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Warmest/Coolest
Since		 Record
September 2020
1-Month 		65.6°F
(18.7°C)		 66.2°F
(19.0°C)		 -0.6°F
(-0.3°C)		 48th Coolest
Coolest since:
 1918
81st Warmest
Warmest since:
 1925, 1933
Ties: 1914, 1946, 1952, 1956
Aug–Sep 2020
2-Month 		69.2°F
(20.7°C)		 69.8°F
(21.0°C)		 -0.6°F
(-0.3°C)		 41st Coolest
Coolest since:
 1967
88th Warmest
Warmest since:
 1936
Ties: 1923, 1934, 1943, 1969, 1979, 2006, 2011
Jul–Sep 2020
3-Month 		71.9°F
(22.2°C)		 71.7°F
(22.1°C)		 0.2°F
(0.1°C)		 70th Coolest
Coolest since:
 1967
59th Warmest
Warmest since:
 1936
Ties: 1940
Jun–Sep 2020
4-Month 		72.3°F
(22.4°C)		 71.7°F
(22.1°C)		 0.6°F
(0.3°C)		 80th Coolest
Coolest since:
 1915, 1924
49th Warmest
Warmest since:
 1936
Ties: 1943
May–Sep 2020
5-Month 		70.0°F
(21.1°C)		 69.7°F
(20.9°C)		 0.3°F
(0.2°C)		 71st Coolest
Coolest since:
 1924
58th Warmest
Warmest since:
 1936
Ties: 1943, 1949, 2013, 2017
Apr–Sep 2020
6-Month 		66.6°F
(19.2°C)		 66.7°F
(19.3°C)		 -0.1°F
(-0.1°C)		 51st Coolest
Coolest since:
 1907
78th Warmest
Warmest since:
 2010
Ties: 1905, 1916, 1971, 1973, 1981
Mar–Sep 2020
7-Month 		63.4°F
(17.4°C)		 62.9°F
(17.2°C)		 0.5°F
(0.2°C)		 76th Coolest
Coolest since:
 1924
53rd Warmest
Warmest since:
 2012
Ties: 1905, 1942, 1983
Feb–Sep 2020
8-Month 		59.5°F
(15.3°C)		 58.7°F
(14.8°C)		 0.8°F
(0.5°C)		 89th Coolest
Coolest since:
 1904
40th Warmest
Warmest since:
 2012
Ties: 1939, 1990, 2022
Jan–Sep 2020
9-Month 		56.4°F
(13.6°C)		 54.9°F
(12.7°C)		 1.5°F
(0.9°C)		 102nd Coolest
Coolest since:
 1904, 1912
27th Warmest
Warmest since:
 2012
Ties: 1919, 1932, 1952
Dec 2019–Sep 2020
10-Month 		54.3°F
(12.4°C)		 52.4°F
(11.3°C)		 1.9°F
(1.1°C)		 109th Coolest
Coolest since:
 1904
19th Warmest
Warmest since:
 2012
Ties: 1931, 1934, 2006
Nov 2019–Sep 2020
11-Month 		52.7°F
(11.5°C)		 51.4°F
(10.8°C)		 1.3°F
(0.7°C)		 98th Coolest
Coolest since:
 1904
30th Warmest
Warmest since:
 2012
Ties: 2022
Oct 2019–Sep 2020
12-Month 		52.8°F
(11.6°C)		 51.6°F
(10.9°C)		 1.2°F
(0.7°C)		 96th Coolest
Coolest since:
 1904
32nd Warmest
Warmest since:
 2012
Ties: 1942, 1976
Apr 2019–Sep 2020
18-Month 		57.8°F
(14.3°C)		 56.7°F
(13.7°C)		 1.1°F
(0.6°C)		 99th Coolest
Coolest since:
 1904, 1918
29th Warmest
Warmest since:
 2012
Ties: 2013
Oct 2018–Sep 2020
24-Month 		52.4°F
(11.3°C)		 51.6°F
(10.9°C)		 0.8°F
(0.4°C)		 91st Coolest
Coolest since:
 1979
36th Warmest
Warmest since:
 2017
Ties: 1998
Oct 2017–Sep 2020
36-Month 		52.6°F
(11.4°C)		 51.6°F
(10.9°C)		 1.0°F
(0.5°C)		 99th Coolest
Coolest since:
 1979
27th Warmest
Warmest since:
 2018
Ties: 1922, 2005, 2021
Oct 2016–Sep 2020
48-Month 		53.2°F
(11.8°C)		 51.6°F
(10.9°C)		 1.6°F
(0.9°C)		 116th Coolest
Coolest since:
 1905
9th Warmest
Warmest since:
 2019
Oct 2015–Sep 2020
60-Month 		53.6°F
(12.0°C)		 51.6°F
(10.9°C)		 2.0°F
(1.1°C)		 123rd Coolest
Coolest since:
 1906
1st Warmest
Warmest to Date
 2020

Citing This Page