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 2

December 2020 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2020 1-Month	2.34	0.09	2.25	116th Driest	Driest since: 2019	1955
December 2020 1-Month	2.34	0.09	2.25	15th Wettest	Wettest since: 2008	1996
Nov–Dec 2020 2-Month	0.76	-0.09	0.85	97th Driest	Driest since: 2019	1931
Nov–Dec 2020 2-Month	0.76	-0.09	0.85	34th Wettest	Wettest since: 2018	1972
Oct–Dec 2020 3-Month	0.63	-0.02	0.65	89th Driest	Driest since: 2017	1930
Oct–Dec 2020 3-Month	0.63	-0.02	0.65	42nd Wettest	Wettest since: 2019	1996
Sep–Dec 2020 4-Month	0.43	0.00	0.43	83rd Driest	Driest since: 2019	2024
	0.43	0.00	0.43	48th Wettest	Wettest since: 2018	2018
	Ties: 1962
Aug–Dec 2020 5-Month	0.90	0.02	0.88	106th Driest	Driest since: 2019	1930
	0.90	0.02	0.88	25th Wettest	Wettest since: 2018	2011
	Ties: 1915
Jul–Dec 2020 6-Month	0.69	0.01	0.68	97th Driest	Driest since: 2019	1930
Jul–Dec 2020 6-Month	0.69	0.01	0.68	34th Wettest	Wettest since: 2018	2018
Jun–Dec 2020 7-Month	0.55	0.02	0.53	97th Driest	Driest since: 2019	1930
	0.55	0.02	0.53	34th Wettest	Wettest since: 2018	2018
	Ties: 1950
May–Dec 2020 8-Month	0.42	-0.02	0.44	90th Driest	Driest since: 2017	1964
	0.42	-0.02	0.44	41st Wettest	Wettest since: 2019	2018
	Ties: 1906
Apr–Dec 2020 9-Month	0.52	-0.01	0.53	98th Driest	Driest since: 2017	1930
	0.52	-0.01	0.53	33rd Wettest	Wettest since: 2019	2018
	Ties: 1993
Mar–Dec 2020 10-Month	0.39	0.00	0.39	92nd Driest	Driest since: 2017	1930
Mar–Dec 2020 10-Month	0.39	0.00	0.39	39th Wettest	Wettest since: 2019	2011
Feb–Dec 2020 11-Month	0.33	0.02	0.31	87th Driest	Driest since: 2017	1930
Feb–Dec 2020 11-Month	0.33	0.02	0.31	44th Wettest	Wettest since: 2019	2018
Jan–Dec 2020 12-Month	0.28	0.03	0.25	80th Driest	Driest since: 2017	1930
Jan–Dec 2020 12-Month	0.28	0.03	0.25	51st Wettest	Wettest since: 2019	2018
Jul 2019–Dec 2020 18-Month	0.23	0.02	0.21	80th Driest	Driest since: 2017	1965
	0.23	0.02	0.21	50th Wettest	Wettest since: 2019	2019
	Ties: 1942
Jan 2019–Dec 2020 24-Month	0.51	0.03	0.48	107th Driest	Driest since: 2017	1931
	0.51	0.03	0.48	23rd Wettest	Wettest since: 2019	2019
	Ties: 1978
Jan 2018–Dec 2020 36-Month	1.13	0.03	1.10	128th Driest	Driest since: 2019	1965
Jan 2018–Dec 2020 36-Month	1.13	0.03	1.10	1st Wettest	Wettest to Date	2020
Jan 2017–Dec 2020 48-Month	0.86	0.03	0.83	126th Driest	Driest since: 2019	1966
Jan 2017–Dec 2020 48-Month	0.86	0.03	0.83	2nd Wettest	Wettest to Date	2021
Jan 2016–Dec 2020 60-Month	0.52	0.03	0.49	114th Driest	Driest since: 2019	1966
Jan 2016–Dec 2020 60-Month	0.52	0.03	0.49	13th Wettest	Wettest since: 2007	1976, 1979, 2021

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 24, 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 2

December 2020 Palmer Z-Index Rankings

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