National Rankings

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Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Average Temperature Rankings, December 1999

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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
December 1999 1-Month	36.10°F (2.28°C)	32.68°F (0.38°C)	3.42°F (1.90°C)	115th Coolest	Coolest since: 1998	1983
December 1999 1-Month	36.10°F (2.28°C)	32.68°F (0.38°C)	3.42°F (1.90°C)	14th Warmest	Warmest since: 1994	2021
Nov–Dec 1999 2-Month	42.11°F (5.62°C)	37.19°F (2.88°C)	4.92°F (2.74°C)	127th Coolest	Coolest since: 1998	2000
Nov–Dec 1999 2-Month	42.11°F (5.62°C)	37.19°F (2.88°C)	4.92°F (2.74°C)	2nd Warmest	Warmest to Date	2021
Oct–Dec 1999 3-Month	46.32°F (7.96°C)	42.83°F (6.02°C)	3.49°F (1.94°C)	126th Coolest	Coolest since: 1998	1898
Oct–Dec 1999 3-Month	46.32°F (7.96°C)	42.83°F (6.02°C)	3.49°F (1.94°C)	3rd Warmest	Warmest to Date	2021
Sep–Dec 1999 4-Month	50.83°F (10.46°C)	48.34°F (9.08°C)	2.49°F (1.38°C)	123rd Coolest	Coolest since: 1997	1976
Sep–Dec 1999 4-Month	50.83°F (10.46°C)	48.34°F (9.08°C)	2.49°F (1.38°C)	6th Warmest	Warmest since: 1998	2021
Aug–Dec 1999 5-Month	55.24°F (12.91°C)	53.09°F (11.72°C)	2.15°F (1.19°C)	122nd Coolest	Coolest since: 1997	1976
Aug–Dec 1999 5-Month	55.24°F (12.91°C)	53.09°F (11.72°C)	2.15°F (1.19°C)	7th Warmest	Warmest since: 1998	2021
Jul–Dec 1999 6-Month	58.42°F (14.68°C)	56.51°F (13.62°C)	1.91°F (1.06°C)	119th Coolest	Coolest since: 1997	1976
Jul–Dec 1999 6-Month	58.42°F (14.68°C)	56.51°F (13.62°C)	1.91°F (1.06°C)	10th Warmest	Warmest since: 1998	2021
Jun–Dec 1999 7-Month	59.83°F (15.46°C)	58.22°F (14.57°C)	1.61°F (0.89°C)	115th Coolest	Coolest since: 1997	1976
Jun–Dec 1999 7-Month	59.83°F (15.46°C)	58.22°F (14.57°C)	1.61°F (0.89°C)	14th Warmest	Warmest since: 1998	2021
May–Dec 1999 8-Month	59.86°F (15.48°C)	58.47°F (14.71°C)	1.39°F (0.77°C)	110th Coolest	Coolest since: 1997	1976
May–Dec 1999 8-Month	59.86°F (15.48°C)	58.47°F (14.71°C)	1.39°F (0.77°C)	19th Warmest	Warmest since: 1998	2021
Apr–Dec 1999 9-Month	58.94°F (14.97°C)	57.64°F (14.24°C)	1.30°F (0.73°C)	112th Coolest	Coolest since: 1997	1917
Apr–Dec 1999 9-Month	58.94°F (14.97°C)	57.64°F (14.24°C)	1.30°F (0.73°C)	17th Warmest	Warmest since: 1998	2021
Mar–Dec 1999 10-Month	57.32°F (14.07°C)	56.03°F (13.35°C)	1.29°F (0.72°C)	110th Coolest	Coolest since: 1997	1917
	57.32°F (14.07°C)	56.03°F (13.35°C)	1.29°F (0.72°C)	19th Warmest	Warmest since: 1998	2012
	Ties: 1936, 1994, 2004
Feb–Dec 1999 11-Month	55.70°F (13.17°C)	54.01°F (12.23°C)	1.69°F (0.94°C)	119th Coolest	Coolest since: 1997	1917
Feb–Dec 1999 11-Month	55.70°F (13.17°C)	54.01°F (12.23°C)	1.69°F (0.94°C)	10th Warmest	Warmest since: 1998	2012
Jan–Dec 1999 12-Month	53.88°F (12.16°C)	52.02°F (11.12°C)	1.86°F (1.04°C)	119th Coolest	Coolest since: 1997	1917
Jan–Dec 1999 12-Month	53.88°F (12.16°C)	52.02°F (11.12°C)	1.86°F (1.04°C)	10th Warmest	Warmest since: 1998	2012
Jul 1998–Dec 1999 18-Month	55.59°F (13.11°C)	53.52°F (11.96°C)	2.07°F (1.15°C)	123rd Coolest	Coolest since: 1998	1917
Jul 1998–Dec 1999 18-Month	55.59°F (13.11°C)	53.52°F (11.96°C)	2.07°F (1.15°C)	5th Warmest	Warmest to Date	2012, 2016
Jan 1998–Dec 1999 24-Month	54.05°F (12.25°C)	52.02°F (11.12°C)	2.03°F (1.13°C)	123rd Coolest	Coolest since: 1998	1917
Jan 1998–Dec 1999 24-Month	54.05°F (12.25°C)	52.02°F (11.12°C)	2.03°F (1.13°C)	5th Warmest	Warmest to Date	2017
Jan 1997–Dec 1999 36-Month	53.44°F (11.91°C)	52.01°F (11.12°C)	1.43°F (0.79°C)	113th Coolest	Coolest since: 1998	1917
Jan 1997–Dec 1999 36-Month	53.44°F (11.91°C)	52.01°F (11.12°C)	1.43°F (0.79°C)	14th Warmest	Warmest to Date	2017
Jan 1996–Dec 1999 48-Month	53.05°F (11.69°C)	52.00°F (11.11°C)	1.05°F (0.58°C)	103rd Coolest	Coolest since: 1998	1917
Jan 1996–Dec 1999 48-Month	53.05°F (11.69°C)	52.00°F (11.11°C)	1.05°F (0.58°C)	23rd Warmest	Warmest since: 1934	2018
Jan 1995–Dec 1999 60-Month	52.97°F (11.65°C)	51.99°F (11.11°C)	0.98°F (0.54°C)	102nd Coolest	Coolest since: 1998	1920
Jan 1995–Dec 1999 60-Month	52.97°F (11.65°C)	51.99°F (11.11°C)	0.98°F (0.54°C)	23rd Warmest	Warmest to Date	2019, 2020

Citing This Page

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