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 6

December 2019 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2019 1-Month	0.83	-0.08	0.91	93rd Driest	Driest since: 2018	1930
	0.83	-0.08	0.91	38th Wettest	Wettest since: 2013	1901
	Ties: 2013
Nov–Dec 2019 2-Month	0.63	-0.15	0.78	90th Driest	Driest since: 2017	1930
Nov–Dec 2019 2-Month	0.63	-0.15	0.78	41st Wettest	Wettest since: 2018	1972
Oct–Dec 2019 3-Month	1.41	-0.09	1.50	111th Driest	Driest since: 2017	1930
Oct–Dec 2019 3-Month	1.41	-0.09	1.50	20th Wettest	Wettest since: 2018	1996
Sep–Dec 2019 4-Month	0.65	-0.04	0.69	93rd Driest	Driest since: 2017	1964
Sep–Dec 2019 4-Month	0.65	-0.04	0.69	38th Wettest	Wettest since: 2018	2011
Aug–Dec 2019 5-Month	0.77	-0.01	0.78	95th Driest	Driest since: 2017	1964
Aug–Dec 2019 5-Month	0.77	-0.01	0.78	36th Wettest	Wettest since: 2018	2018
Jul–Dec 2019 6-Month	0.84	0.01	0.83	99th Driest	Driest since: 2017	1964
	0.84	0.01	0.83	32nd Wettest	Wettest since: 2018	2018
	Ties: 1973
Jun–Dec 2019 7-Month	0.98	0.03	0.95	106th Driest	Driest since: 2017	1964
Jun–Dec 2019 7-Month	0.98	0.03	0.95	25th Wettest	Wettest since: 2018	2018
May–Dec 2019 8-Month	1.17	0.01	1.16	114th Driest	Driest since: 2017	1964
May–Dec 2019 8-Month	1.17	0.01	1.16	17th Wettest	Wettest since: 2018	2018
Apr–Dec 2019 9-Month	1.21	0.03	1.18	118th Driest	Driest since: 2017	1964
Apr–Dec 2019 9-Month	1.21	0.03	1.18	13th Wettest	Wettest since: 2018	2018
Mar–Dec 2019 10-Month	0.98	0.02	0.96	115th Driest	Driest since: 2017	1964
Mar–Dec 2019 10-Month	0.98	0.02	0.96	16th Wettest	Wettest since: 2018	2011
Feb–Dec 2019 11-Month	0.88	0.01	0.87	112th Driest	Driest since: 2017	1964
Feb–Dec 2019 11-Month	0.88	0.01	0.87	19th Wettest	Wettest since: 2018	2011
Jan–Dec 2019 12-Month	1.06	0.03	1.03	120th Driest	Driest since: 2017	1991
Jan–Dec 2019 12-Month	1.06	0.03	1.03	11th Wettest	Wettest since: 2018	2011, 2018
Jul 2018–Dec 2019 18-Month	2.21	0.02	2.19	129th Driest	Driest since: 2018	1965
Jul 2018–Dec 2019 18-Month	2.21	0.02	2.19	1st Wettest	Wettest to Date	2019
Jan 2018–Dec 2019 24-Month	1.81	0.03	1.78	129th Driest	Driest since: 2018	1964
Jan 2018–Dec 2019 24-Month	1.81	0.03	1.78	1st Wettest	Wettest to Date	2019
Jan 2017–Dec 2019 36-Month	1.43	0.03	1.40	128th Driest	Driest since: 2018	1965
Jan 2017–Dec 2019 36-Month	1.43	0.03	1.40	1st Wettest	Wettest to Date	2019
Jan 2016–Dec 2019 48-Month	0.93	0.03	0.90	123rd Driest	Driest since: 2018	1966
Jan 2016–Dec 2019 48-Month	0.93	0.03	0.90	5th Wettest	Wettest since: 2006	2006
Jan 2015–Dec 2019 60-Month	0.69	0.03	0.66	114th Driest	Driest since: 2018	1966
Jan 2015–Dec 2019 60-Month	0.69	0.03	0.66	13th Wettest	Wettest since: 2012	2021

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 6

December 2019 Palmer Z-Index Rankings

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