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.

Pennsylvania

Average Temperature Rankings, December 1999

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Record Warmest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Warmest/Coolest Since	Record
December 1999 1-Month	32.4°F (0.2°C)	28.9°F (-1.7°C)	3.5°F (1.9°C)	98th Coolest	Coolest since: 1997	1989
December 1999 1-Month	32.4°F (0.2°C)	28.9°F (-1.7°C)	3.5°F (1.9°C)	31st Warmest	Warmest since: 1998	2015
Nov–Dec 1999 2-Month	38.6°F (3.7°C)	34.1°F (1.2°C)	4.5°F (2.5°C)	119th Coolest	Coolest since: 1997	1917
Nov–Dec 1999 2-Month	38.6°F (3.7°C)	34.1°F (1.2°C)	4.5°F (2.5°C)	10th Warmest	Warmest since: 1998	2015
Oct–Dec 1999 3-Month	42.2°F (5.7°C)	39.7°F (4.3°C)	2.5°F (1.4°C)	108th Coolest	Coolest since: 1997	1917
Oct–Dec 1999 3-Month	42.2°F (5.7°C)	39.7°F (4.3°C)	2.5°F (1.4°C)	21st Warmest	Warmest since: 1998	2015
Sep–Dec 1999 4-Month	47.3°F (8.5°C)	45.1°F (7.3°C)	2.2°F (1.2°C)	111th Coolest	Coolest since: 1997	1917
	47.3°F (8.5°C)	45.1°F (7.3°C)	2.2°F (1.2°C)	18th Warmest	Warmest since: 1998	2015
	Ties: 1984, 2018
Aug–Dec 1999 5-Month	51.6°F (10.9°C)	49.8°F (9.9°C)	1.8°F (1.0°C)	108th Coolest	Coolest since: 1997	1917
	51.6°F (10.9°C)	49.8°F (9.9°C)	1.8°F (1.0°C)	21st Warmest	Warmest since: 1998	2015
	Ties: 1961
Jul–Dec 1999 6-Month	55.3°F (12.9°C)	53.2°F (11.8°C)	2.1°F (1.1°C)	115th Coolest	Coolest since: 1997	1976
	55.3°F (12.9°C)	53.2°F (11.8°C)	2.1°F (1.1°C)	14th Warmest	Warmest since: 1998	1931, 2015
	Ties: 2012
Jun–Dec 1999 7-Month	57.0°F (13.9°C)	55.0°F (12.8°C)	2.0°F (1.1°C)	116th Coolest	Coolest since: 1997	1917
	57.0°F (13.9°C)	55.0°F (12.8°C)	2.0°F (1.1°C)	13th Warmest	Warmest since: 1998	2015
	Ties: 1971, 2006
May–Dec 1999 8-Month	57.3°F (14.1°C)	55.4°F (13.0°C)	1.9°F (1.1°C)	115th Coolest	Coolest since: 1997	1917
May–Dec 1999 8-Month	57.3°F (14.1°C)	55.4°F (13.0°C)	1.9°F (1.1°C)	14th Warmest	Warmest since: 1998	2015
Apr–Dec 1999 9-Month	56.3°F (13.5°C)	54.4°F (12.4°C)	1.9°F (1.1°C)	115th Coolest	Coolest since: 1997	1917
	56.3°F (13.5°C)	54.4°F (12.4°C)	1.9°F (1.1°C)	14th Warmest	Warmest since: 1998	2015
	Ties: 1959, 2006, 2018
Mar–Dec 1999 10-Month	54.1°F (12.3°C)	52.5°F (11.4°C)	1.6°F (0.9°C)	110th Coolest	Coolest since: 1997	1917
	54.1°F (12.3°C)	52.5°F (11.4°C)	1.6°F (0.9°C)	19th Warmest	Warmest since: 1998	2021
	Ties: 1959
Feb–Dec 1999 11-Month	52.1°F (11.2°C)	50.2°F (10.1°C)	1.9°F (1.1°C)	114th Coolest	Coolest since: 1997	1917
	52.1°F (11.2°C)	50.2°F (10.1°C)	1.9°F (1.1°C)	15th Warmest	Warmest since: 1998	2012
	Ties: 2001, 2019, 2022
Jan–Dec 1999 12-Month	50.0°F (10.0°C)	48.1°F (8.9°C)	1.9°F (1.1°C)	112th Coolest	Coolest since: 1997	1917
Jan–Dec 1999 12-Month	50.0°F (10.0°C)	48.1°F (8.9°C)	1.9°F (1.1°C)	17th Warmest	Warmest since: 1998	1998, 2012
Jul 1998–Dec 1999 18-Month	51.9°F (11.1°C)	49.9°F (9.9°C)	2.0°F (1.2°C)	117th Coolest	Coolest since: 1997	1904
	51.9°F (11.1°C)	49.9°F (9.9°C)	2.0°F (1.2°C)	11th Warmest	Warmest since: 1998	2012
	Ties: 1932
Jan 1998–Dec 1999 24-Month	50.9°F (10.5°C)	48.2°F (9.0°C)	2.7°F (1.5°C)	125th Coolest	Coolest since: 1998	1905
Jan 1998–Dec 1999 24-Month	50.9°F (10.5°C)	48.2°F (9.0°C)	2.7°F (1.5°C)	3rd Warmest	Warmest to Date	2021
Jan 1997–Dec 1999 36-Month	49.9°F (9.9°C)	48.1°F (8.9°C)	1.8°F (1.0°C)	117th Coolest	Coolest since: 1998	1905, 1926
	49.9°F (9.9°C)	48.1°F (8.9°C)	1.8°F (1.0°C)	10th Warmest	Warmest to Date	2012
	Ties: 2007
Jan 1996–Dec 1999 48-Month	49.3°F (9.6°C)	48.1°F (8.9°C)	1.2°F (0.7°C)	107th Coolest	Coolest since: 1998	1907
	49.3°F (9.6°C)	48.1°F (8.9°C)	1.2°F (0.7°C)	19th Warmest	Warmest since: 1993	2021, 2022
	Ties: 1993, 2004, 2006
Jan 1995–Dec 1999 60-Month	49.2°F (9.6°C)	48.1°F (8.9°C)	1.1°F (0.7°C)	103rd Coolest	Coolest since: 1998	1905, 1907
	49.2°F (9.6°C)	48.1°F (8.9°C)	1.1°F (0.7°C)	22nd Warmest	Warmest since: 1991	2020, 2021
	Ties: 1991, 2000, 2004

Citing This Page

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