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.

Montana

Average Temperature Rankings, September 1991

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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 1991 1-Month	55.6°F (13.1°C)	53.8°F (12.1°C)	1.8°F (1.0°C)	90th Coolest	Coolest since: 1989	1965
	55.6°F (13.1°C)	53.8°F (12.1°C)	1.8°F (1.0°C)	39th Warmest	Warmest since: 1990	1998
	Ties: 1931
Aug–Sep 1991 2-Month	62.1°F (16.7°C)	59.0°F (15.0°C)	3.1°F (1.7°C)	113th Coolest	Coolest since: 1989	1965
	62.1°F (16.7°C)	59.0°F (15.0°C)	3.1°F (1.7°C)	16th Warmest	Warmest since: 1990	2022
	Ties: 2009
Jul–Sep 1991 3-Month	63.5°F (17.5°C)	61.2°F (16.2°C)	2.3°F (1.3°C)	109th Coolest	Coolest since: 1989	1912
Jul–Sep 1991 3-Month	63.5°F (17.5°C)	61.2°F (16.2°C)	2.3°F (1.3°C)	20th Warmest	Warmest since: 1990	2022
Jun–Sep 1991 4-Month	62.2°F (16.8°C)	60.5°F (15.8°C)	1.7°F (1.0°C)	102nd Coolest	Coolest since: 1989	1993
Jun–Sep 1991 4-Month	62.2°F (16.8°C)	60.5°F (15.8°C)	1.7°F (1.0°C)	27th Warmest	Warmest since: 1990	2021
May–Sep 1991 5-Month	59.7°F (15.4°C)	58.4°F (14.7°C)	1.3°F (0.7°C)	97th Coolest	Coolest since: 1989	1907
	59.7°F (15.4°C)	58.4°F (14.7°C)	1.3°F (0.7°C)	32nd Warmest	Warmest since: 1990	1936
	Ties: 1966, 2016
Apr–Sep 1991 6-Month	56.5°F (13.6°C)	55.5°F (13.1°C)	1.0°F (0.5°C)	95th Coolest	Coolest since: 1989	1907
	56.5°F (13.6°C)	55.5°F (13.1°C)	1.0°F (0.5°C)	34th Warmest	Warmest since: 1990	1936
	Ties: 1963, 1976, 1980
Mar–Sep 1991 7-Month	53.0°F (11.7°C)	51.7°F (10.9°C)	1.3°F (0.8°C)	95th Coolest	Coolest since: 1989	1965
	53.0°F (11.7°C)	51.7°F (10.9°C)	1.3°F (0.8°C)	34th Warmest	Warmest since: 1990	2012
	Ties: 1933, 1946, 1949, 2005
Feb–Sep 1991 8-Month	50.6°F (10.3°C)	47.9°F (8.8°C)	2.7°F (1.5°C)	117th Coolest	Coolest since: 1990	1899
	50.6°F (10.3°C)	47.9°F (8.8°C)	2.7°F (1.5°C)	12th Warmest	Warmest since: 1988	2012, 2016
	Ties: 2000, 2006
Jan–Sep 1991 9-Month	46.7°F (8.2°C)	44.5°F (6.9°C)	2.2°F (1.3°C)	107th Coolest	Coolest since: 1989	1899
	46.7°F (8.2°C)	44.5°F (6.9°C)	2.2°F (1.3°C)	22nd Warmest	Warmest since: 1990	2012
	Ties: 2022
Dec 1990–Sep 1991 10-Month	43.4°F (6.3°C)	42.1°F (5.6°C)	1.3°F (0.7°C)	86th Coolest	Coolest since: 1989	1950
Dec 1990–Sep 1991 10-Month	43.4°F (6.3°C)	42.1°F (5.6°C)	1.3°F (0.7°C)	42nd Warmest	Warmest since: 1990	2012
Nov 1990–Sep 1991 11-Month	42.5°F (5.8°C)	41.0°F (5.0°C)	1.5°F (0.8°C)	95th Coolest	Coolest since: 1989	1899
Nov 1990–Sep 1991 11-Month	42.5°F (5.8°C)	41.0°F (5.0°C)	1.5°F (0.8°C)	33rd Warmest	Warmest since: 1990	2012
Oct 1990–Sep 1991 12-Month	42.5°F (5.8°C)	41.2°F (5.1°C)	1.3°F (0.7°C)	97th Coolest	Coolest since: 1989	1899
	42.5°F (5.8°C)	41.2°F (5.1°C)	1.3°F (0.7°C)	31st Warmest	Warmest since: 1990	2012
	Ties: 1976
Apr 1990–Sep 1991 18-Month	47.3°F (8.5°C)	45.9°F (7.7°C)	1.4°F (0.8°C)	103rd Coolest	Coolest since: 1989	1917
	47.3°F (8.5°C)	45.9°F (7.7°C)	1.4°F (0.8°C)	25th Warmest	Warmest since: 1990	2016
	Ties: 1963, 2003
Oct 1989–Sep 1991 24-Month	42.9°F (6.1°C)	41.1°F (5.1°C)	1.8°F (1.0°C)	110th Coolest	Coolest since: 1990	1917
Oct 1989–Sep 1991 24-Month	42.9°F (6.1°C)	41.1°F (5.1°C)	1.8°F (1.0°C)	17th Warmest	Warmest since: 1988	2016
Oct 1988–Sep 1991 36-Month	42.3°F (5.7°C)	41.1°F (5.1°C)	1.2°F (0.6°C)	99th Coolest	Coolest since: 1987	1951
	42.3°F (5.7°C)	41.1°F (5.1°C)	1.2°F (0.6°C)	27th Warmest	Warmest since: 1990	2017
	Ties: 2021
Oct 1987–Sep 1991 48-Month	42.8°F (6.0°C)	41.1°F (5.1°C)	1.7°F (0.9°C)	111th Coolest	Coolest since: 1989	1952
Oct 1987–Sep 1991 48-Month	42.8°F (6.0°C)	41.1°F (5.1°C)	1.7°F (0.9°C)	14th Warmest	Warmest since: 1990	2007, 2017, 2018
Oct 1986–Sep 1991 60-Month	43.1°F (6.2°C)	41.1°F (5.1°C)	2.0°F (1.1°C)	119th Coolest	Coolest since: 1990	1952
	43.1°F (6.2°C)	41.1°F (5.1°C)	2.0°F (1.1°C)	5th Warmest	Warmest to Date	2016
	Ties: 2002, 2006, 2009

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published March 2023, retrieved on March 23, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings