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, August 2009

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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
August 2009 1-Month	70.9°F (21.6°C)	73.4°F (23.0°C)	-2.5°F (-1.4°C)	16th Coolest	Coolest since: 2004	1915
August 2009 1-Month	70.9°F (21.6°C)	73.4°F (23.0°C)	-2.5°F (-1.4°C)	113th Warmest	Warmest since: 2008	1947
Jul–Aug 2009 2-Month	70.6°F (21.4°C)	74.5°F (23.6°C)	-3.9°F (-2.2°C)	3rd Coolest	Coolest since: 1967	1915
	70.6°F (21.4°C)	74.5°F (23.6°C)	-3.9°F (-2.2°C)	126th Warmest	Warmest since: 2008	1936
	Ties: 1950
Jun–Aug 2009 3-Month	71.3°F (21.8°C)	73.5°F (23.1°C)	-2.2°F (-1.3°C)	13th Coolest	Coolest since: 2004	1915
	71.3°F (21.8°C)	73.5°F (23.1°C)	-2.2°F (-1.3°C)	116th Warmest	Warmest since: 2008	1936
	Ties: 1958, 1985
May–Aug 2009 4-Month	69.2°F (20.7°C)	70.6°F (21.4°C)	-1.4°F (-0.7°C)	18th Coolest	Coolest since: 1997	1915
	69.2°F (20.7°C)	70.6°F (21.4°C)	-1.4°F (-0.7°C)	111th Warmest	Warmest since: 2008	1936
	Ties: 1903, 1920, 1960, 1974
Apr–Aug 2009 5-Month	65.6°F (18.7°C)	66.8°F (19.3°C)	-1.2°F (-0.6°C)	21st Coolest	Coolest since: 1997	1907
	65.6°F (18.7°C)	66.8°F (19.3°C)	-1.2°F (-0.6°C)	108th Warmest	Warmest since: 2008	1934
	Ties: 1982, 1996
Mar–Aug 2009 6-Month	62.0°F (16.7°C)	62.3°F (16.8°C)	-0.3°F (-0.1°C)	43rd Coolest	Coolest since: 2008	1950, 1960
	62.0°F (16.7°C)	62.3°F (16.8°C)	-0.3°F (-0.1°C)	86th Warmest	Warmest since: 2007	2012
	Ties: 1902, 1932, 1937
Feb–Aug 2009 7-Month	57.7°F (14.3°C)	57.6°F (14.2°C)	0.1°F (0.1°C)	69th Coolest	Coolest since: 2008	1904
	57.7°F (14.3°C)	57.6°F (14.2°C)	0.1°F (0.1°C)	60th Warmest	Warmest since: 2007	2012
	Ties: 1898, 1913, 1935, 1945, 1948, 1985
Jan–Aug 2009 8-Month	53.1°F (11.7°C)	53.6°F (12.0°C)	-0.5°F (-0.3°C)	47th Coolest	Coolest since: 2008	1912
	53.1°F (11.7°C)	53.6°F (12.0°C)	-0.5°F (-0.3°C)	82nd Warmest	Warmest since: 2007	2012
	Ties: 1928, 1948, 1968, 1980, 2013
Dec 2008–Aug 2009 9-Month	50.2°F (10.1°C)	50.9°F (10.5°C)	-0.7°F (-0.4°C)	35th Coolest	Coolest since: 2008	1904
	50.2°F (10.1°C)	50.9°F (10.5°C)	-0.7°F (-0.4°C)	93rd Warmest	Warmest since: 2008	2012
	Ties: 1928, 1936, 1950, 1967, 1994, 2008
Nov 2008–Aug 2009 10-Month	49.3°F (9.6°C)	49.9°F (9.9°C)	-0.6°F (-0.3°C)	38th Coolest	Coolest since: 2001	1904
	49.3°F (9.6°C)	49.9°F (9.9°C)	-0.6°F (-0.3°C)	90th Warmest	Warmest since: 2008	2012
	Ties: 2001
Oct 2008–Aug 2009 11-Month	49.7°F (9.8°C)	50.3°F (10.2°C)	-0.6°F (-0.4°C)	37th Coolest	Coolest since: 1997	1904
	49.7°F (9.8°C)	50.3°F (10.2°C)	-0.6°F (-0.4°C)	91st Warmest	Warmest since: 2008	2012
	Ties: 1945, 1962, 1965, 1967, 1968
Sep 2008–Aug 2009 12-Month	51.2°F (10.7°C)	51.6°F (10.9°C)	-0.4°F (-0.2°C)	40th Coolest	Coolest since: 1997	1904
	51.2°F (10.7°C)	51.6°F (10.9°C)	-0.4°F (-0.2°C)	88th Warmest	Warmest since: 2008	2012
	Ties: 1906, 1945, 1961, 1962
Mar 2008–Aug 2009 18-Month	54.6°F (12.6°C)	55.2°F (12.9°C)	-0.6°F (-0.3°C)	34th Coolest	Coolest since: 1997	1904
	54.6°F (12.6°C)	55.2°F (12.9°C)	-0.6°F (-0.3°C)	94th Warmest	Warmest since: 2008	2012
	Ties: 1925, 1936, 1984
Sep 2007–Aug 2009 24-Month	51.6°F (10.9°C)	51.6°F (10.9°C)	0.0°F (0.0°C)	57th Coolest	Coolest since: 1997	1905
	51.6°F (10.9°C)	51.6°F (10.9°C)	0.0°F (0.0°C)	70th Warmest	Warmest since: 2008	2017
	Ties: 1915, 1944, 1946, 1990
Sep 2006–Aug 2009 36-Month	52.1°F (11.2°C)	51.6°F (10.9°C)	0.5°F (0.3°C)	81st Coolest	Coolest since: 1998	1979
	52.1°F (11.2°C)	51.6°F (10.9°C)	0.5°F (0.3°C)	45th Warmest	Warmest since: 2008	2018
	Ties: 1944, 1949, 1976
Sep 2005–Aug 2009 48-Month	52.6°F (11.4°C)	51.6°F (10.9°C)	1.0°F (0.5°C)	102nd Coolest	Coolest since: 2004	1905
	52.6°F (11.4°C)	51.6°F (10.9°C)	1.0°F (0.5°C)	23rd Warmest	Warmest since: 2008	2019
	Ties: 1922, 1932, 1988
Sep 2004–Aug 2009 60-Month	52.9°F (11.6°C)	51.6°F (10.9°C)	1.3°F (0.7°C)	113th Coolest	Coolest since: 2005	1906
	52.9°F (11.6°C)	51.6°F (10.9°C)	1.3°F (0.7°C)	11th Warmest	Warmest since: 2008	2020
	Ties: 1957, 2012, 2013

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published May 2023, retrieved on June 2, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings