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 1940

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Record Coolest
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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
September 1940 1-Month	65.5°F (18.6°C)	66.2°F (19.0°C)	-0.7°F (-0.4°C)	47th Coolest	Coolest since: 1937	1918
September 1940 1-Month	65.5°F (18.6°C)	66.2°F (19.0°C)	-0.7°F (-0.4°C)	82nd Warmest	Warmest since: 1939	1925, 1933
Aug–Sep 1940 2-Month	69.8°F (21.0°C)	69.8°F (21.0°C)	0.0°F (0.0°C)	65th Coolest	Coolest since: 1934	1967
	69.8°F (21.0°C)	69.8°F (21.0°C)	0.0°F (0.0°C)	64th Warmest	Warmest since: 1939	1936
	Ties: 1956
Jul–Sep 1940 3-Month	71.9°F (22.2°C)	71.7°F (22.1°C)	0.2°F (0.1°C)	70th Coolest	Coolest since: 1932	1967
	71.9°F (22.2°C)	71.7°F (22.1°C)	0.2°F (0.1°C)	59th Warmest	Warmest since: 1939	1936
	Ties: 2020
Jun–Sep 1940 4-Month	72.0°F (22.2°C)	71.7°F (22.1°C)	0.3°F (0.1°C)	75th Coolest	Coolest since: 1937	1915, 1924
	72.0°F (22.2°C)	71.7°F (22.1°C)	0.3°F (0.1°C)	54th Warmest	Warmest since: 1939	1936
	Ties: 1906, 1937, 1948, 2017
May–Sep 1940 5-Month	69.4°F (20.8°C)	69.7°F (20.9°C)	-0.3°F (-0.1°C)	47th Coolest	Coolest since: 1935	1924
	69.4°F (20.8°C)	69.7°F (20.9°C)	-0.3°F (-0.1°C)	82nd Warmest	Warmest since: 1939	1936
	Ties: 1972, 1993
Apr–Sep 1940 6-Month	66.1°F (18.9°C)	66.7°F (19.3°C)	-0.6°F (-0.4°C)	37th Coolest	Coolest since: 1935	1907
	66.1°F (18.9°C)	66.7°F (19.3°C)	-0.6°F (-0.4°C)	92nd Warmest	Warmest since: 1939	2010
	Ties: 1975, 2003
Mar–Sep 1940 7-Month	61.8°F (16.6°C)	62.9°F (17.2°C)	-1.1°F (-0.6°C)	24th Coolest	Coolest since: 1928	1924
	61.8°F (16.6°C)	62.9°F (17.2°C)	-1.1°F (-0.6°C)	105th Warmest	Warmest since: 1939	2012
	Ties: 1966, 1969, 1993, 2014
Feb–Sep 1940 8-Month	57.8°F (14.3°C)	58.7°F (14.8°C)	-0.9°F (-0.5°C)	31st Coolest	Coolest since: 1929	1904
	57.8°F (14.3°C)	58.7°F (14.8°C)	-0.9°F (-0.5°C)	98th Warmest	Warmest since: 1939	2012
	Ties: 1895, 1916, 2008
Jan–Sep 1940 9-Month	52.8°F (11.6°C)	54.9°F (12.7°C)	-2.1°F (-1.1°C)	9th Coolest	Coolest since: 1924	1904, 1912
Jan–Sep 1940 9-Month	52.8°F (11.6°C)	54.9°F (12.7°C)	-2.1°F (-1.1°C)	120th Warmest	Warmest since: 1939	2012
Dec 1939–Sep 1940 10-Month	50.9°F (10.5°C)	52.4°F (11.3°C)	-1.5°F (-0.8°C)	17th Coolest	Coolest since: 1924	1904
	50.9°F (10.5°C)	52.4°F (11.3°C)	-1.5°F (-0.8°C)	111th Warmest	Warmest since: 1939	2012
	Ties: 1963
Nov 1939–Sep 1940 11-Month	49.9°F (9.9°C)	51.4°F (10.8°C)	-1.5°F (-0.9°C)	15th Coolest	Coolest since: 1924	1904
	49.9°F (9.9°C)	51.4°F (10.8°C)	-1.5°F (-0.9°C)	113th Warmest	Warmest since: 1939	2012
	Ties: 1915, 1984
Oct 1939–Sep 1940 12-Month	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	21st Coolest	Coolest since: 1926	1904
	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	107th Warmest	Warmest since: 1939	2012
	Ties: 1907, 1915, 1970, 1997
Apr 1939–Sep 1940 18-Month	56.2°F (13.4°C)	56.7°F (13.7°C)	-0.5°F (-0.3°C)	39th Coolest	Coolest since: 1936	1904, 1918
	56.2°F (13.4°C)	56.7°F (13.7°C)	-0.5°F (-0.3°C)	89th Warmest	Warmest since: 1939	2012
	Ties: 1907, 2015
Oct 1938–Sep 1940 24-Month	51.9°F (11.1°C)	51.6°F (10.9°C)	0.3°F (0.2°C)	79th Coolest	Coolest since: 1937	1979
	51.9°F (11.1°C)	51.6°F (10.9°C)	0.3°F (0.2°C)	48th Warmest	Warmest since: 1939	2017
	Ties: 1947, 1957, 1974, 1984, 1995
Oct 1937–Sep 1940 36-Month	52.2°F (11.2°C)	51.6°F (10.9°C)	0.6°F (0.3°C)	86th Coolest	Coolest since: 1938	1979
Oct 1937–Sep 1940 36-Month	52.2°F (11.2°C)	51.6°F (10.9°C)	0.6°F (0.3°C)	40th Warmest	Warmest since: 1939	2018
Oct 1936–Sep 1940 48-Month	52.0°F (11.1°C)	51.6°F (10.9°C)	0.4°F (0.2°C)	79th Coolest	Coolest since: 1938	1905
	52.0°F (11.1°C)	51.6°F (10.9°C)	0.4°F (0.2°C)	46th Warmest	Warmest since: 1939	2019
	Ties: 1949, 1976, 1986, 1998, 2011
Oct 1935–Sep 1940 60-Month	51.8°F (11.0°C)	51.6°F (10.9°C)	0.2°F (0.1°C)	65th Coolest	Coolest since: 1931	1906
	51.8°F (11.0°C)	51.6°F (10.9°C)	0.2°F (0.1°C)	59th Warmest	Warmest since: 1939	2020
	Ties: 1924, 1948, 1949

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published May 2023, retrieved on June 1, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings