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 5. East

Average Temperature Rankings, August 1999

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
August 1999 1-Month	70.2°F (21.2°C)	72.1°F (22.3°C)	-1.9°F (-1.1°C)	28th Coolest	Coolest since: 1997	1915
August 1999 1-Month	70.2°F (21.2°C)	72.1°F (22.3°C)	-1.9°F (-1.1°C)	101st Warmest	Warmest since: 1998	1947
Jul–Aug 1999 2-Month	73.9°F (23.3°C)	73.2°F (22.9°C)	0.7°F (0.4°C)	86th Coolest	Coolest since: 1998	1915
	73.9°F (23.3°C)	73.2°F (22.9°C)	0.7°F (0.4°C)	43rd Warmest	Warmest since: 1998	1936
	Ties: 1952, 1957, 1998, 2001, 2020
Jun–Aug 1999 3-Month	73.2°F (22.9°C)	72.3°F (22.4°C)	0.9°F (0.5°C)	89th Coolest	Coolest since: 1998	1915
	73.2°F (22.9°C)	72.3°F (22.4°C)	0.9°F (0.5°C)	40th Warmest	Warmest since: 1995	1936
	Ties: 1911
May–Aug 1999 4-Month	70.9°F (21.6°C)	69.4°F (20.8°C)	1.5°F (0.8°C)	101st Coolest	Coolest since: 1997	1915
	70.9°F (21.6°C)	69.4°F (20.8°C)	1.5°F (0.8°C)	28th Warmest	Warmest since: 1998	1934
	Ties: 1952, 2016, 2022
Apr–Aug 1999 5-Month	67.3°F (19.6°C)	65.5°F (18.6°C)	1.8°F (1.0°C)	110th Coolest	Coolest since: 1997	1907
	67.3°F (19.6°C)	65.5°F (18.6°C)	1.8°F (1.0°C)	19th Warmest	Warmest since: 1998	1991
	Ties: 1954, 2007, 2011
Mar–Aug 1999 6-Month	62.2°F (16.8°C)	61.0°F (16.1°C)	1.2°F (0.7°C)	100th Coolest	Coolest since: 1997	1904, 1907
	62.2°F (16.8°C)	61.0°F (16.1°C)	1.2°F (0.7°C)	29th Warmest	Warmest since: 1998	2012
	Ties: 1896, 1922, 1942, 1946, 1973, 2001
Feb–Aug 1999 7-Month	58.4°F (14.7°C)	56.2°F (13.4°C)	2.2°F (1.3°C)	115th Coolest	Coolest since: 1997	1904
Feb–Aug 1999 7-Month	58.4°F (14.7°C)	56.2°F (13.4°C)	2.2°F (1.3°C)	14th Warmest	Warmest since: 1998	2012
Jan–Aug 1999 8-Month	53.9°F (12.2°C)	52.1°F (11.2°C)	1.8°F (1.0°C)	103rd Coolest	Coolest since: 1997	1904, 1912
	53.9°F (12.2°C)	52.1°F (11.2°C)	1.8°F (1.0°C)	26th Warmest	Warmest since: 1998	2012
	Ties: 1973
Dec 1998–Aug 1999 9-Month	51.8°F (11.0°C)	49.5°F (9.7°C)	2.3°F (1.3°C)	114th Coolest	Coolest since: 1997	1904
	51.8°F (11.0°C)	49.5°F (9.7°C)	2.3°F (1.3°C)	14th Warmest	Warmest since: 1998	2012
	Ties: 1953, 2020
Nov 1998–Aug 1999 10-Month	51.1°F (10.6°C)	48.5°F (9.2°C)	2.6°F (1.4°C)	119th Coolest	Coolest since: 1997	1904
	51.1°F (10.6°C)	48.5°F (9.2°C)	2.6°F (1.4°C)	9th Warmest	Warmest since: 1998	2012
	Ties: 1987, 1995, 2000, 2005
Oct 1998–Aug 1999 11-Month	51.5°F (10.8°C)	48.9°F (9.4°C)	2.6°F (1.4°C)	119th Coolest	Coolest since: 1997	1904
	51.5°F (10.8°C)	48.9°F (9.4°C)	2.6°F (1.4°C)	9th Warmest	Warmest since: 1998	2012
	Ties: 1954, 1995
Sep 1998–Aug 1999 12-Month	53.1°F (11.7°C)	50.3°F (10.2°C)	2.8°F (1.5°C)	121st Coolest	Coolest since: 1998	1904
Sep 1998–Aug 1999 12-Month	53.1°F (11.7°C)	50.3°F (10.2°C)	2.8°F (1.5°C)	7th Warmest	Warmest since: 1991	2012
Mar 1998–Aug 1999 18-Month	56.3°F (13.5°C)	53.8°F (12.1°C)	2.5°F (1.4°C)	124th Coolest	Coolest since: 1998	1904
Mar 1998–Aug 1999 18-Month	56.3°F (13.5°C)	53.8°F (12.1°C)	2.5°F (1.4°C)	4th Warmest	Warmest to Date	2012
Sep 1997–Aug 1999 24-Month	53.0°F (11.7°C)	50.3°F (10.2°C)	2.7°F (1.5°C)	125th Coolest	Coolest since: 1998	1905
	53.0°F (11.7°C)	50.3°F (10.2°C)	2.7°F (1.5°C)	2nd Warmest	Warmest to Date	2017
	Ties: 2012
Sep 1996–Aug 1999 36-Month	51.7°F (10.9°C)	50.3°F (10.2°C)	1.4°F (0.7°C)	106th Coolest	Coolest since: 1998	1904
	51.7°F (10.9°C)	50.3°F (10.2°C)	1.4°F (0.7°C)	20th Warmest	Warmest since: 1992	2018
	Ties: 1954, 1992
Sep 1995–Aug 1999 48-Month	51.0°F (10.6°C)	50.3°F (10.2°C)	0.7°F (0.4°C)	88th Coolest	Coolest since: 1998	1905
	51.0°F (10.6°C)	50.3°F (10.2°C)	0.7°F (0.4°C)	37th Warmest	Warmest since: 1994	2019
	Ties: 1923, 1987, 1994
Sep 1994–Aug 1999 60-Month	51.3°F (10.7°C)	50.3°F (10.2°C)	1.0°F (0.5°C)	95th Coolest	Coolest since: 1998	1906
	51.3°F (10.7°C)	50.3°F (10.2°C)	1.0°F (0.5°C)	29th Warmest	Warmest since: 1995	2020
	Ties: 1933, 1987, 1990, 1995, 2000

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published November 2022, retrieved on December 1, 2022 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/rankings