Statewide Rankings

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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 2018

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
September 2018 1-Month	70.3°F (21.3°C)	66.2°F (19.0°C)	4.1°F (2.3°C)	118th Coolest	Coolest since: 2017	1918
	70.3°F (21.3°C)	66.2°F (19.0°C)	4.1°F (2.3°C)	11th Warmest	Warmest since: 2016	1925, 1933
	Ties: 1921
Aug–Sep 2018 2-Month	72.5°F (22.5°C)	69.8°F (21.0°C)	2.7°F (1.5°C)	115th Coolest	Coolest since: 2017	1967
	72.5°F (22.5°C)	69.8°F (21.0°C)	2.7°F (1.5°C)	14th Warmest	Warmest since: 2016	1936
	Ties: 1980
Jul–Sep 2018 3-Month	73.3°F (22.9°C)	71.7°F (22.1°C)	1.6°F (0.8°C)	102nd Coolest	Coolest since: 2017	1967
	73.3°F (22.9°C)	71.7°F (22.1°C)	1.6°F (0.8°C)	27th Warmest	Warmest since: 2016	1936
	Ties: 2021
Jun–Sep 2018 4-Month	73.7°F (23.2°C)	71.6°F (22.0°C)	2.1°F (1.2°C)	115th Coolest	Coolest since: 2017	1915, 1924
	73.7°F (23.2°C)	71.6°F (22.0°C)	2.1°F (1.2°C)	14th Warmest	Warmest since: 2016	1936
	Ties: 1913, 1925, 1953
May–Sep 2018 5-Month	73.1°F (22.8°C)	69.7°F (20.9°C)	3.4°F (1.9°C)	127th Coolest	Coolest since: 2017	1924
May–Sep 2018 5-Month	73.1°F (22.8°C)	69.7°F (20.9°C)	3.4°F (1.9°C)	2nd Warmest	Warmest since: 1936	1936
Apr–Sep 2018 6-Month	68.4°F (20.2°C)	66.7°F (19.3°C)	1.7°F (0.9°C)	109th Coolest	Coolest since: 2017	1907
	68.4°F (20.2°C)	66.7°F (19.3°C)	1.7°F (0.9°C)	20th Warmest	Warmest since: 2016	2010
	Ties: 1914, 1959
Mar–Sep 2018 7-Month	64.2°F (17.9°C)	62.8°F (17.1°C)	1.4°F (0.8°C)	104th Coolest	Coolest since: 2017	1924
	64.2°F (17.9°C)	62.8°F (17.1°C)	1.4°F (0.8°C)	25th Warmest	Warmest since: 2017	2012
	Ties: 1930, 2017
Feb–Sep 2018 8-Month	60.2°F (15.7°C)	58.7°F (14.8°C)	1.5°F (0.9°C)	111th Coolest	Coolest since: 2015	1904
	60.2°F (15.7°C)	58.7°F (14.8°C)	1.5°F (0.9°C)	18th Warmest	Warmest since: 2017	2012
	Ties: 1931, 1953, 1986, 1999, 2002, 2007
Jan–Sep 2018 9-Month	56.2°F (13.4°C)	55.0°F (12.8°C)	1.2°F (0.6°C)	94th Coolest	Coolest since: 2015	1904, 1912
	56.2°F (13.4°C)	55.0°F (12.8°C)	1.2°F (0.6°C)	35th Warmest	Warmest since: 2017	2012
	Ties: 1941, 1964, 1973
Dec 2017–Sep 2018 10-Month	53.5°F (11.9°C)	52.4°F (11.3°C)	1.1°F (0.6°C)	90th Coolest	Coolest since: 2015	1904
Dec 2017–Sep 2018 10-Month	53.5°F (11.9°C)	52.4°F (11.3°C)	1.1°F (0.6°C)	38th Warmest	Warmest since: 2017	2012
Nov 2017–Sep 2018 11-Month	52.5°F (11.4°C)	51.4°F (10.8°C)	1.1°F (0.6°C)	95th Coolest	Coolest since: 2015	1904
	52.5°F (11.4°C)	51.4°F (10.8°C)	1.1°F (0.6°C)	33rd Warmest	Warmest since: 2017	2012
	Ties: 1925, 1941, 1976, 2004
Oct 2017–Sep 2018 12-Month	52.9°F (11.6°C)	51.6°F (10.9°C)	1.3°F (0.7°C)	100th Coolest	Coolest since: 2015	1904
	52.9°F (11.6°C)	51.6°F (10.9°C)	1.3°F (0.7°C)	28th Warmest	Warmest since: 2017	2012
	Ties: 1914, 1933, 1934
Apr 2017–Sep 2018 18-Month	57.9°F (14.4°C)	56.7°F (13.7°C)	1.2°F (0.7°C)	102nd Coolest	Coolest since: 2015	1904, 1918
	57.9°F (14.4°C)	56.7°F (13.7°C)	1.2°F (0.7°C)	26th Warmest	Warmest since: 2017	2012
	Ties: 1953
Oct 2016–Sep 2018 24-Month	54.0°F (12.2°C)	51.7°F (10.9°C)	2.3°F (1.3°C)	123rd Coolest	Coolest since: 2016	1979
	54.0°F (12.2°C)	51.7°F (10.9°C)	2.3°F (1.3°C)	4th Warmest	Warmest since: 2017	2017
	Ties: 1999
Oct 2015–Sep 2018 36-Month	54.4°F (12.4°C)	51.6°F (10.9°C)	2.8°F (1.5°C)	125th Coolest	Coolest since: 2017	1979
Oct 2015–Sep 2018 36-Month	54.4°F (12.4°C)	51.6°F (10.9°C)	2.8°F (1.5°C)	1st Warmest	Warmest to Date	2018
Oct 2014–Sep 2018 48-Month	53.6°F (12.0°C)	51.6°F (10.9°C)	2.0°F (1.1°C)	123rd Coolest	Coolest since: 2017	1905
Oct 2014–Sep 2018 48-Month	53.6°F (12.0°C)	51.6°F (10.9°C)	2.0°F (1.1°C)	2nd Warmest	Warmest to Date	2019
Oct 2013–Sep 2018 60-Month	52.7°F (11.5°C)	51.6°F (10.9°C)	1.1°F (0.6°C)	106th Coolest	Coolest since: 2017	1906
	52.7°F (11.5°C)	51.6°F (10.9°C)	1.1°F (0.6°C)	18th Warmest	Warmest since: 2016	2020
	Ties: 1933, 1936, 1956, 2001, 2004, 2005

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published January 2023, retrieved on January 29, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings