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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 1978 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1978 1-Month	0.49	0.09	0.40	82nd Driest	Driest since: 1976	1955
December 1978 1-Month	0.49	0.09	0.40	49th Wettest	Wettest since: 1977	1996
Nov–Dec 1978 2-Month	-0.54	-0.09	-0.45	48th Driest	Driest since: 1976	1931
	-0.54	-0.09	-0.45	83rd Wettest	Wettest since: 1977	1972
	Ties: 1910
Oct–Dec 1978 3-Month	-0.38	-0.02	-0.36	49th Driest	Driest since: 1974	1930
Oct–Dec 1978 3-Month	-0.38	-0.02	-0.36	82nd Wettest	Wettest since: 1977	1996
Sep–Dec 1978 4-Month	-0.37	0.00	-0.37	40th Driest	Driest since: 1965	2024
	-0.37	0.00	-0.37	91st Wettest	Wettest since: 1977	2018
	Ties: 1933
Aug–Dec 1978 5-Month	0.23	0.02	0.21	67th Driest	Driest since: 1970	1930
Aug–Dec 1978 5-Month	0.23	0.02	0.21	64th Wettest	Wettest since: 1977	2011
Jul–Dec 1978 6-Month	0.11	0.01	0.10	65th Driest	Driest since: 1968	1930
Jul–Dec 1978 6-Month	0.11	0.01	0.10	66th Wettest	Wettest since: 1977	2018
Jun–Dec 1978 7-Month	0.00	0.02	-0.02	58th Driest	Driest since: 1968	1930
Jun–Dec 1978 7-Month	0.00	0.02	-0.02	73rd Wettest	Wettest since: 1977	2018
May–Dec 1978 8-Month	0.29	-0.02	0.31	77th Driest	Driest since: 1970	1964
May–Dec 1978 8-Month	0.29	-0.02	0.31	54th Wettest	Wettest since: 1977	2018
Apr–Dec 1978 9-Month	0.02	-0.01	0.03	60th Driest	Driest since: 1970	1930
Apr–Dec 1978 9-Month	0.02	-0.01	0.03	71st Wettest	Wettest since: 1977	2018
Mar–Dec 1978 10-Month	0.10	0.00	0.10	71st Driest	Driest since: 1971	1930
	0.10	0.00	0.10	60th Wettest	Wettest since: 1977	2011
	Ties: 1958
Feb–Dec 1978 11-Month	-0.08	0.02	-0.10	53rd Driest	Driest since: 1968	1930
	-0.08	0.02	-0.10	78th Wettest	Wettest since: 1977	2018
	Ties: 1917
Jan–Dec 1978 12-Month	0.41	0.03	0.38	95th Driest	Driest since: 1976	1930
	0.41	0.03	0.38	36th Wettest	Wettest since: 1977	2018
	Ties: 1901
Jul 1977–Dec 1978 18-Month	0.70	0.02	0.68	116th Driest	Driest since: 1977	1965
	0.70	0.02	0.68	14th Wettest	Wettest since: 1976	2019
	Ties: 1976
Jan 1977–Dec 1978 24-Month	0.51	0.03	0.48	107th Driest	Driest since: 1977	1931
Jan 1977–Dec 1978 24-Month	0.51	0.03	0.48	23rd Wettest	Wettest since: 1976	2019
Jan 1976–Dec 1978 36-Month	0.47	0.03	0.44	107th Driest	Driest since: 1972	1965
Jan 1976–Dec 1978 36-Month	0.47	0.03	0.44	22nd Wettest	Wettest since: 1977	2020
Jan 1975–Dec 1978 48-Month	0.66	0.03	0.63	121st Driest	Driest since: 1977	1966
	0.66	0.03	0.63	7th Wettest	Wettest since: 1975	2021
	Ties: 1905
Jan 1974–Dec 1978 60-Month	0.58	0.03	0.55	116th Driest	Driest since: 1974	1966
Jan 1974–Dec 1978 60-Month	0.58	0.03	0.55	11th Wettest	Wettest since: 1977	1976, 1979, 2021

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 22, 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 1978 Palmer Z-Index Rankings

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