Climate at a Glance | Divisional Rankings | National Centers for Environmental Information (NCEI)

Divisional Rankings

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Please note, Degree Days and Palmer Indices are not available for Alaska or Hawaii. 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, Climate Division 1

December 1999 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1999 1-Month	-1.42	0.04	-1.46	26th Driest	Driest since: 1998	1998
December 1999 1-Month	-1.42	0.04	-1.46	105th Wettest	Wettest since: 1997	1973
Nov–Dec 1999 2-Month	-1.30	-0.11	-1.19	25th Driest	Driest since: 1998	1931
Nov–Dec 1999 2-Month	-1.30	-0.11	-1.19	106th Wettest	Wettest since: 1997	1972
Oct–Dec 1999 3-Month	-1.01	-0.05	-0.96	30th Driest	Driest since: 1998	1931
Oct–Dec 1999 3-Month	-1.01	-0.05	-0.96	101st Wettest	Wettest since: 1997	1927
Sep–Dec 1999 4-Month	0.55	-0.02	0.57	84th Driest	Driest since: 1998	1931
Sep–Dec 1999 4-Month	0.55	-0.02	0.57	47th Wettest	Wettest since: 1996	2018
Aug–Dec 1999 5-Month	0.03	-0.02	0.05	61st Driest	Driest since: 1998	1964
	0.03	-0.02	0.05	70th Wettest	Wettest since: 1997	2011
	Ties: 1956, 1989
Jul–Dec 1999 6-Month	-0.55	-0.03	-0.52	39th Driest	Driest since: 1998	1964
Jul–Dec 1999 6-Month	-0.55	-0.03	-0.52	92nd Wettest	Wettest since: 1997	2018
Jun–Dec 1999 7-Month	-0.78	-0.01	-0.77	21st Driest	Driest since: 1998	1964
Jun–Dec 1999 7-Month	-0.78	-0.01	-0.77	110th Wettest	Wettest since: 1997	2011
May–Dec 1999 8-Month	-0.89	-0.04	-0.85	20th Driest	Driest since: 1998	1964
May–Dec 1999 8-Month	-0.89	-0.04	-0.85	111th Wettest	Wettest since: 1997	2011
Apr–Dec 1999 9-Month	-0.97	-0.04	-0.93	15th Driest	Driest since: 1991	1964
	-0.97	-0.04	-0.93	116th Wettest	Wettest since: 1998	2011
	Ties: 1966
Mar–Dec 1999 10-Month	-0.76	-0.03	-0.73	20th Driest	Driest since: 1995	1964
Mar–Dec 1999 10-Month	-0.76	-0.03	-0.73	111th Wettest	Wettest since: 1998	2011
Feb–Dec 1999 11-Month	-0.80	-0.02	-0.78	16th Driest	Driest since: 1995	1964
Feb–Dec 1999 11-Month	-0.80	-0.02	-0.78	115th Wettest	Wettest since: 1998	2011
Jan–Dec 1999 12-Month	-0.40	-0.01	-0.39	32nd Driest	Driest since: 1997	1964
Jan–Dec 1999 12-Month	-0.40	-0.01	-0.39	99th Wettest	Wettest since: 1998	2011
Jul 1998–Dec 1999 18-Month	-0.87	-0.02	-0.85	7th Driest	Driest since: 1965	1965
Jul 1998–Dec 1999 18-Month	-0.87	-0.02	-0.85	123rd Wettest	Wettest since: 1998	2011
Jan 1998–Dec 1999 24-Month	-0.30	-0.02	-0.28	30th Driest	Driest since: 1998	1964, 1965
Jan 1998–Dec 1999 24-Month	-0.30	-0.02	-0.28	100th Wettest	Wettest since: 1997	2019
Jan 1997–Dec 1999 36-Month	-0.38	-0.02	-0.36	17th Driest	Driest since: 1982	1965
Jan 1997–Dec 1999 36-Month	-0.38	-0.02	-0.36	112th Wettest	Wettest since: 1998	2019
Jan 1996–Dec 1999 48-Month	0.14	-0.01	0.15	78th Driest	Driest since: 1998	1966
	0.14	-0.01	0.15	50th Wettest	Wettest since: 1997	2021
	Ties: 1902, 1947, 1985
Jan 1995–Dec 1999 60-Month	-0.06	-0.01	-0.05	46th Driest	Driest since: 1995	1966
	-0.06	-0.01	-0.05	81st Wettest	Wettest since: 1998	1976, 2022
	Ties: 1915

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 31, 2025 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/divisional/rankings

Climate at a Glance Divisional Rankings

Divisional Rankings

Pennsylvania, Climate Division 1

December 1999 Palmer Z-Index Rankings

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