Divisional 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, Climate Division 8. Southwest

Average Temperature Rankings, August 2015

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
August 2015 1-Month	74.4°F (23.6°C)	76.0°F (24.4°C)	-1.6°F (-0.8°C)	26th Coolest	Coolest since: 2009	1915
August 2015 1-Month	74.4°F (23.6°C)	76.0°F (24.4°C)	-1.6°F (-0.8°C)	103rd Warmest	Warmest since: 2014	1936
Jul–Aug 2015 2-Month	76.4°F (24.7°C)	76.9°F (24.9°C)	-0.5°F (-0.2°C)	45th Coolest	Coolest since: 2014	1967
	76.4°F (24.7°C)	76.9°F (24.9°C)	-0.5°F (-0.2°C)	84th Warmest	Warmest since: 2012	1936
	Ties: 1902, 1908, 1942, 1948, 1960, 1962, 2017
Jun–Aug 2015 3-Month	76.1°F (24.5°C)	75.9°F (24.4°C)	0.2°F (0.1°C)	69th Coolest	Coolest since: 2014	1915, 1927
	76.1°F (24.5°C)	75.9°F (24.4°C)	0.2°F (0.1°C)	60th Warmest	Warmest since: 2012	1936
	Ties: 1956, 2001, 2019
May–Aug 2015 4-Month	73.9°F (23.3°C)	73.2°F (22.9°C)	0.7°F (0.4°C)	82nd Coolest	Coolest since: 2014	1967
	73.9°F (23.3°C)	73.2°F (22.9°C)	0.7°F (0.4°C)	47th Warmest	Warmest since: 2012	1936
	Ties: 1916, 1949, 1955, 2019
Apr–Aug 2015 5-Month	70.8°F (21.6°C)	69.6°F (20.9°C)	1.2°F (0.7°C)	93rd Coolest	Coolest since: 2014	1907
	70.8°F (21.6°C)	69.6°F (20.9°C)	1.2°F (0.7°C)	36th Warmest	Warmest since: 2012	2010
	Ties: 1925, 1943, 1944, 1999
Mar–Aug 2015 6-Month	66.3°F (19.1°C)	65.5°F (18.6°C)	0.8°F (0.5°C)	87th Coolest	Coolest since: 2014	1904
	66.3°F (19.1°C)	65.5°F (18.6°C)	0.8°F (0.5°C)	42nd Warmest	Warmest since: 2012	2012
	Ties: 1913
Feb–Aug 2015 7-Month	60.5°F (15.8°C)	61.0°F (16.1°C)	-0.5°F (-0.3°C)	43rd Coolest	Coolest since: 2014	1904
	60.5°F (15.8°C)	61.0°F (16.1°C)	-0.5°F (-0.3°C)	86th Warmest	Warmest since: 2012	2012
	Ties: 1897, 1916, 1965, 1997
Jan–Aug 2015 8-Month	56.9°F (13.8°C)	57.3°F (14.1°C)	-0.4°F (-0.3°C)	43rd Coolest	Coolest since: 2014	1912
	56.9°F (13.8°C)	57.3°F (14.1°C)	-0.4°F (-0.3°C)	86th Warmest	Warmest since: 2013	2012
	Ties: 1903, 1972, 1993, 2013
Dec 2014–Aug 2015 9-Month	54.9°F (12.7°C)	54.9°F (12.7°C)	0.0°F (0.0°C)	62nd Coolest	Coolest since: 2014	1904
	54.9°F (12.7°C)	54.9°F (12.7°C)	0.0°F (0.0°C)	66th Warmest	Warmest since: 2013	2012
	Ties: 1959
Nov 2014–Aug 2015 10-Month	53.2°F (11.8°C)	53.8°F (12.1°C)	-0.6°F (-0.3°C)	40th Coolest	Coolest since: 2014	1904
	53.2°F (11.8°C)	53.8°F (12.1°C)	-0.6°F (-0.3°C)	88th Warmest	Warmest since: 2013	2012
	Ties: 1907
Oct 2014–Aug 2015 11-Month	53.7°F (12.1°C)	54.2°F (12.3°C)	-0.5°F (-0.2°C)	39th Coolest	Coolest since: 2014	1904
	53.7°F (12.1°C)	54.2°F (12.3°C)	-0.5°F (-0.2°C)	89th Warmest	Warmest since: 2013	2012
	Ties: 1928, 1973, 1989
Sep 2014–Aug 2015 12-Month	54.8°F (12.7°C)	55.4°F (13.0°C)	-0.6°F (-0.3°C)	35th Coolest	Coolest since: 2014	1904
	54.8°F (12.7°C)	55.4°F (13.0°C)	-0.6°F (-0.3°C)	93rd Warmest	Warmest since: 2013	2012
	Ties: 1945, 1967, 1971, 1975, 1993
Mar 2014–Aug 2015 18-Month	58.2°F (14.6°C)	58.8°F (14.9°C)	-0.6°F (-0.3°C)	35th Coolest	Coolest since: 2014	1904
	58.2°F (14.6°C)	58.8°F (14.9°C)	-0.6°F (-0.3°C)	93rd Warmest	Warmest since: 2013	2012
	Ties: 1928, 1971, 1980
Sep 2013–Aug 2015 24-Month	54.4°F (12.4°C)	55.4°F (13.0°C)	-1.0°F (-0.6°C)	13th Coolest	Coolest since: 1997	1979
	54.4°F (12.4°C)	55.4°F (13.0°C)	-1.0°F (-0.6°C)	114th Warmest	Warmest since: 2014	2017
	Ties: 1900, 1951, 1968
Sep 2012–Aug 2015 36-Month	54.7°F (12.6°C)	55.4°F (13.0°C)	-0.7°F (-0.4°C)	22nd Coolest	Coolest since: 1984	1979
	54.7°F (12.6°C)	55.4°F (13.0°C)	-0.7°F (-0.4°C)	104th Warmest	Warmest since: 2014	2018
	Ties: 1968
Sep 2011–Aug 2015 48-Month	56.0°F (13.3°C)	55.4°F (13.0°C)	0.6°F (0.3°C)	88th Coolest	Coolest since: 2004	1980
	56.0°F (13.3°C)	55.4°F (13.0°C)	0.6°F (0.3°C)	37th Warmest	Warmest since: 2014	2019
	Ties: 1939, 1941, 1989, 1991, 1992, 1993
Sep 2010–Aug 2015 60-Month	56.1°F (13.4°C)	55.4°F (13.0°C)	0.7°F (0.4°C)	93rd Coolest	Coolest since: 2000	1906
	56.1°F (13.4°C)	55.4°F (13.0°C)	0.7°F (0.4°C)	31st Warmest	Warmest since: 2014	2020
	Ties: 1923, 1932, 1938, 1942, 2000

Citing This Page

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