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 1979

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
September 1979 1-Month	65.7°F (18.7°C)	66.2°F (19.0°C)	-0.5°F (-0.3°C)	53rd Coolest	Coolest since: 1976	1918
	65.7°F (18.7°C)	66.2°F (19.0°C)	-0.5°F (-0.3°C)	76th Warmest	Warmest since: 1978	1925, 1933
	Ties: 1901
Aug–Sep 1979 2-Month	69.1°F (20.6°C)	69.8°F (21.0°C)	-0.7°F (-0.4°C)	40th Coolest	Coolest since: 1976	1967
	69.1°F (20.6°C)	69.8°F (21.0°C)	-0.7°F (-0.4°C)	89th Warmest	Warmest since: 1978	1936
	Ties: 1952
Jul–Sep 1979 3-Month	70.7°F (21.5°C)	71.8°F (22.1°C)	-1.1°F (-0.6°C)	34th Coolest	Coolest since: 1976	1967
	70.7°F (21.5°C)	71.8°F (22.1°C)	-1.1°F (-0.6°C)	95th Warmest	Warmest since: 1978	1936
	Ties: 1945
Jun–Sep 1979 4-Month	71.0°F (21.7°C)	71.7°F (22.1°C)	-0.7°F (-0.4°C)	41st Coolest	Coolest since: 1976	1915, 1924
	71.0°F (21.7°C)	71.7°F (22.1°C)	-0.7°F (-0.4°C)	88th Warmest	Warmest since: 1978	1936
	Ties: 1942, 1981
May–Sep 1979 5-Month	69.1°F (20.6°C)	69.8°F (21.0°C)	-0.7°F (-0.4°C)	35th Coolest	Coolest since: 1976	1924
	69.1°F (20.6°C)	69.8°F (21.0°C)	-0.7°F (-0.4°C)	94th Warmest	Warmest since: 1978	1936
	Ties: 1920, 1963, 1969, 1982, 1990, 2008, 2014
Apr–Sep 1979 6-Month	65.7°F (18.7°C)	66.7°F (19.3°C)	-1.0°F (-0.6°C)	29th Coolest	Coolest since: 1976	1907
	65.7°F (18.7°C)	66.7°F (19.3°C)	-1.0°F (-0.6°C)	100th Warmest	Warmest since: 1978	2010
	Ties: 1918, 1958, 2009
Mar–Sep 1979 7-Month	62.0°F (16.7°C)	62.9°F (17.2°C)	-0.9°F (-0.5°C)	33rd Coolest	Coolest since: 1975	1924
	62.0°F (16.7°C)	62.9°F (17.2°C)	-0.9°F (-0.5°C)	96th Warmest	Warmest since: 1978	2012
	Ties: 1927
Feb–Sep 1979 8-Month	56.4°F (13.6°C)	58.6°F (14.8°C)	-2.2°F (-1.2°C)	6th Coolest	Coolest since: 1958	1904
	56.4°F (13.6°C)	58.6°F (14.8°C)	-2.2°F (-1.2°C)	123rd Warmest	Warmest since: 1978	2012
	Ties: 1958
Jan–Sep 1979 9-Month	51.6°F (10.9°C)	55.0°F (12.8°C)	-3.4°F (-1.9°C)	3rd Coolest	Coolest since: 1912	1904, 1912
Jan–Sep 1979 9-Month	51.6°F (10.9°C)	55.0°F (12.8°C)	-3.4°F (-1.9°C)	126th Warmest	Warmest since: 1978	2012
Dec 1978–Sep 1979 10-Month	49.3°F (9.6°C)	52.4°F (11.3°C)	-3.1°F (-1.7°C)	2nd Coolest	Coolest since: 1904	1904
Dec 1978–Sep 1979 10-Month	49.3°F (9.6°C)	52.4°F (11.3°C)	-3.1°F (-1.7°C)	126th Warmest	Warmest since: 1978	2012
Nov 1978–Sep 1979 11-Month	48.8°F (9.3°C)	51.4°F (10.8°C)	-2.6°F (-1.5°C)	4th Coolest	Coolest since: 1912	1904
Nov 1978–Sep 1979 11-Month	48.8°F (9.3°C)	51.4°F (10.8°C)	-2.6°F (-1.5°C)	124th Warmest	Warmest since: 1978	2012
Oct 1978–Sep 1979 12-Month	49.1°F (9.5°C)	51.7°F (10.9°C)	-2.6°F (-1.4°C)	4th Coolest	Coolest since: 1978	1904
	49.1°F (9.5°C)	51.7°F (10.9°C)	-2.6°F (-1.4°C)	124th Warmest	Warmest since: 1978	2012
	Ties: 1978
Apr 1978–Sep 1979 18-Month	55.1°F (12.8°C)	56.6°F (13.7°C)	-1.5°F (-0.9°C)	6th Coolest	Coolest since: 1951	1904, 1918
Apr 1978–Sep 1979 18-Month	55.1°F (12.8°C)	56.6°F (13.7°C)	-1.5°F (-0.9°C)	122nd Warmest	Warmest since: 1978	2012
Oct 1977–Sep 1979 24-Month	49.1°F (9.5°C)	51.6°F (10.9°C)	-2.5°F (-1.4°C)	1st Coolest	Coolest since: 1979	1979
Oct 1977–Sep 1979 24-Month	49.1°F (9.5°C)	51.6°F (10.9°C)	-2.5°F (-1.4°C)	126th Warmest	Warmest since: 1978	2017
Oct 1976–Sep 1979 36-Month	49.5°F (9.7°C)	51.6°F (10.9°C)	-2.1°F (-1.2°C)	1st Coolest	Coolest since: 1979	1979
Oct 1976–Sep 1979 36-Month	49.5°F (9.7°C)	51.6°F (10.9°C)	-2.1°F (-1.2°C)	125th Warmest	Warmest since: 1978	2018
Oct 1975–Sep 1979 48-Month	50.3°F (10.2°C)	51.6°F (10.9°C)	-1.3°F (-0.7°C)	5th Coolest	Coolest since: 1918	1905
	50.3°F (10.2°C)	51.6°F (10.9°C)	-1.3°F (-0.7°C)	120th Warmest	Warmest since: 1978	2019
	Ties: 1904, 1906
Oct 1974–Sep 1979 60-Month	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	7th Coolest	Coolest since: 1908	1906
Oct 1974–Sep 1979 60-Month	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	117th Warmest	Warmest since: 1978	2020

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