Statewide Rankings

Statewide Data Info
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 1999

View Period (Months):
Download: CSV JSON XML
  • Record Coolest
  • Bottom ⅒
  • Bottom ⅓
  • Normal
  • Top ⅓
  • Top ⅒
  • Record Warmest
PeriodValue1901-2000
Mean		AnomalyRank
(1895-2022)		Warmest/Coolest
Since		Record
September 1999
1-Month		65.2°F
(18.4°C)		66.2°F
(19.0°C)		-1.0°F
(-0.6°C)		41st Coolest
Coolest since:
1918
88th Warmest
Warmest since:
1925, 1933
Ties: 1968
Aug–Sep 1999
2-Month		68.5°F
(20.3°C)		69.8°F
(21.0°C)		-1.3°F
(-0.7°C)		31st Coolest
Coolest since:
1967
98th Warmest
Warmest since:
1936
Jul–Sep 1999
3-Month		71.8°F
(22.1°C)		71.7°F
(22.1°C)		0.1°F
(0.0°C)		68th Coolest
Coolest since:
1967
61st Warmest
Warmest since:
1936
Ties: 1932, 1952, 2006, 2017
Jun–Sep 1999
4-Month		71.9°F
(22.2°C)		71.7°F
(22.1°C)		0.2°F
(0.1°C)		70th Coolest
Coolest since:
1915, 1924
59th Warmest
Warmest since:
1936
Ties: 1977
May–Sep 1999
5-Month		70.4°F
(21.3°C)		69.7°F
(20.9°C)		0.7°F
(0.4°C)		83rd Coolest
Coolest since:
1924
46th Warmest
Warmest since:
1936
Ties: 1932, 1970
Apr–Sep 1999
6-Month		67.7°F
(19.8°C)		66.7°F
(19.3°C)		1.0°F
(0.5°C)		89th Coolest
Coolest since:
1907
40th Warmest
Warmest since:
2010
Ties: 1952, 1953, 2006, 2011
Mar–Sep 1999
7-Month		63.5°F
(17.5°C)		62.9°F
(17.2°C)		0.6°F
(0.3°C)		85th Coolest
Coolest since:
1924
44th Warmest
Warmest since:
2012
Ties: 1895, 1896, 1908, 1913, 1963, 1995, 2001, 2004
Feb–Sep 1999
8-Month		60.2°F
(15.7°C)		58.7°F
(14.8°C)		1.5°F
(0.9°C)		111th Coolest
Coolest since:
1904
18th Warmest
Warmest since:
2012
Ties: 1922, 1931, 1953, 1986, 2002, 2007, 2018
Jan–Sep 1999
9-Month		56.3°F
(13.5°C)		54.9°F
(12.7°C)		1.4°F
(0.8°C)		98th Coolest
Coolest since:
1904, 1912
31st Warmest
Warmest since:
2012
Ties: 1930, 1944, 1983
Dec 1998–Sep 1999
10-Month		54.2°F
(12.3°C)		52.4°F
(11.3°C)		1.8°F
(1.0°C)		105th Coolest
Coolest since:
1904
23rd Warmest
Warmest since:
2012
Ties: 1955
Nov 1998–Sep 1999
11-Month		53.4°F
(11.9°C)		51.4°F
(10.8°C)		2.0°F
(1.1°C)		114th Coolest
Coolest since:
1904
14th Warmest
Warmest since:
2012
Ties: 2006
Oct 1998–Sep 1999
12-Month		53.7°F
(12.1°C)		51.6°F
(10.9°C)		2.1°F
(1.2°C)		115th Coolest
Coolest since:
1904
13th Warmest
Warmest since:
2012
Apr 1998–Sep 1999
18-Month		58.7°F
(14.8°C)		56.7°F
(13.7°C)		2.0°F
(1.1°C)		122nd Coolest
Coolest since:
1904, 1918
6th Warmest
Warmest since:
2012
Ties: 2006
Oct 1997–Sep 1999
24-Month		54.0°F
(12.2°C)		51.6°F
(10.9°C)		2.4°F
(1.3°C)		123rd Coolest
Coolest since:
1979
4th Warmest
Warmest to Date
2017
Ties: 2018
Oct 1996–Sep 1999
36-Month		52.8°F
(11.6°C)		51.6°F
(10.9°C)		1.2°F
(0.7°C)		105th Coolest
Coolest since:
1979
21st Warmest
Warmest since:
2018
Ties: 1921, 1992
Oct 1995–Sep 1999
48-Month		52.1°F
(11.2°C)		51.6°F
(10.9°C)		0.5°F
(0.3°C)		81st Coolest
Coolest since:
1905
44th Warmest
Warmest since:
2019
Ties: 1987
Oct 1994–Sep 1999
60-Month		52.3°F
(11.3°C)		51.6°F
(10.9°C)		0.7°F
(0.4°C)		87th Coolest
Coolest since:
1906
37th Warmest
Warmest since:
2020
Ties: 1958, 1989, 2011

Citing This Page