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 1951

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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 1951 1-Month	62.8°F (17.1°C)	66.2°F (19.0°C)	-3.4°F (-1.9°C)	11th Coolest	Coolest since: 1949	1918
September 1951 1-Month	62.8°F (17.1°C)	66.2°F (19.0°C)	-3.4°F (-1.9°C)	118th Warmest	Warmest since: 1950	1925, 1933
Aug–Sep 1951 2-Month	67.4°F (19.7°C)	69.8°F (21.0°C)	-2.4°F (-1.3°C)	11th Coolest	Coolest since: 1950	1967
Aug–Sep 1951 2-Month	67.4°F (19.7°C)	69.8°F (21.0°C)	-2.4°F (-1.3°C)	118th Warmest	Warmest since: 1948	1936
Jul–Sep 1951 3-Month	69.6°F (20.9°C)	71.7°F (22.1°C)	-2.1°F (-1.2°C)	9th Coolest	Coolest since: 1950	1967
	69.6°F (20.9°C)	71.7°F (22.1°C)	-2.1°F (-1.2°C)	120th Warmest	Warmest since: 1949	1936
	Ties: 2014
Jun–Sep 1951 4-Month	69.4°F (20.8°C)	71.7°F (22.1°C)	-2.3°F (-1.3°C)	10th Coolest	Coolest since: 1950	1915, 1924
	69.4°F (20.8°C)	71.7°F (22.1°C)	-2.3°F (-1.3°C)	119th Warmest	Warmest since: 1949	1936
	Ties: 1917, 1928
May–Sep 1951 5-Month	68.2°F (20.1°C)	69.7°F (20.9°C)	-1.5°F (-0.8°C)	17th Coolest	Coolest since: 1950	1924
	68.2°F (20.1°C)	69.7°F (20.9°C)	-1.5°F (-0.8°C)	112th Warmest	Warmest since: 1949	1936
	Ties: 1946
Apr–Sep 1951 6-Month	64.9°F (18.3°C)	66.7°F (19.3°C)	-1.8°F (-1.0°C)	10th Coolest	Coolest since: 1950	1907
	64.9°F (18.3°C)	66.7°F (19.3°C)	-1.8°F (-1.0°C)	119th Warmest	Warmest since: 1949	2010
	Ties: 1945, 1961
Mar–Sep 1951 7-Month	60.8°F (16.0°C)	62.9°F (17.2°C)	-2.1°F (-1.2°C)	5th Coolest	Coolest since: 1950	1924
	60.8°F (16.0°C)	62.9°F (17.2°C)	-2.1°F (-1.2°C)	124th Warmest	Warmest since: 1949	2012
	Ties: 1907, 1915
Feb–Sep 1951 8-Month	56.9°F (13.8°C)	58.7°F (14.8°C)	-1.8°F (-1.0°C)	15th Coolest	Coolest since: 1950	1904
	56.9°F (13.8°C)	58.7°F (14.8°C)	-1.8°F (-1.0°C)	114th Warmest	Warmest since: 1949	2012
	Ties: 1947, 1989
Jan–Sep 1951 9-Month	53.5°F (11.9°C)	54.9°F (12.7°C)	-1.4°F (-0.8°C)	19th Coolest	Coolest since: 1940	1904, 1912
	53.5°F (11.9°C)	54.9°F (12.7°C)	-1.4°F (-0.8°C)	110th Warmest	Warmest since: 1950	2012
	Ties: 1966, 1996
Dec 1950–Sep 1951 10-Month	50.3°F (10.2°C)	52.4°F (11.3°C)	-2.1°F (-1.1°C)	10th Coolest	Coolest since: 1920	1904
	50.3°F (10.2°C)	52.4°F (11.3°C)	-2.1°F (-1.1°C)	118th Warmest	Warmest since: 1950	2012
	Ties: 1920
Nov 1950–Sep 1951 11-Month	48.9°F (9.4°C)	51.4°F (10.8°C)	-2.5°F (-1.4°C)	5th Coolest	Coolest since: 1912	1904
	48.9°F (9.4°C)	51.4°F (10.8°C)	-2.5°F (-1.4°C)	123rd Warmest	Warmest since: 1950	2012
	Ties: 1978
Oct 1950–Sep 1951 12-Month	49.7°F (9.8°C)	51.6°F (10.9°C)	-1.9°F (-1.1°C)	10th Coolest	Coolest since: 1926	1904
	49.7°F (9.8°C)	51.6°F (10.9°C)	-1.9°F (-1.1°C)	118th Warmest	Warmest since: 1950	2012
	Ties: 1926, 1982
Apr 1950–Sep 1951 18-Month	54.5°F (12.5°C)	56.7°F (13.7°C)	-2.2°F (-1.2°C)	3rd Coolest	Coolest since: 1918	1904, 1918
Apr 1950–Sep 1951 18-Month	54.5°F (12.5°C)	56.7°F (13.7°C)	-2.2°F (-1.2°C)	125th Warmest	Warmest since: 1950	2012
Oct 1949–Sep 1951 24-Month	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	10th Coolest	Coolest since: 1927	1979
	50.5°F (10.3°C)	51.6°F (10.9°C)	-1.1°F (-0.6°C)	117th Warmest	Warmest since: 1950	2017
	Ties: 1903, 1913
Oct 1948–Sep 1951 36-Month	51.1°F (10.6°C)	51.6°F (10.9°C)	-0.5°F (-0.3°C)	26th Coolest	Coolest since: 1929	1979
	51.1°F (10.6°C)	51.6°F (10.9°C)	-0.5°F (-0.3°C)	100th Warmest	Warmest since: 1950	2018
	Ties: 1901, 1952, 1961, 1967, 1968, 1982
Oct 1947–Sep 1951 48-Month	51.3°F (10.7°C)	51.6°F (10.9°C)	-0.3°F (-0.2°C)	34th Coolest	Coolest since: 1930	1905
	51.3°F (10.7°C)	51.6°F (10.9°C)	-0.3°F (-0.2°C)	91st Warmest	Warmest since: 1950	2019
	Ties: 1900, 1903, 1909, 1928, 1930, 1960, 1964, 1965, 1984
Oct 1946–Sep 1951 60-Month	51.4°F (10.8°C)	51.6°F (10.9°C)	-0.2°F (-0.1°C)	41st Coolest	Coolest since: 1930	1906
	51.4°F (10.8°C)	51.6°F (10.9°C)	-0.2°F (-0.1°C)	83rd Warmest	Warmest since: 1950	2020
	Ties: 1901, 1915, 1917, 1921, 1926, 1968, 1984, 1985, 1996

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2023, retrieved on March 31, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings