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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 1977 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1977 1-Month	2.47	0.09	2.38	118th Driest	Driest since: 1976	1955
December 1977 1-Month	2.47	0.09	2.38	13th Wettest	Wettest since: 1973	1996
Nov–Dec 1977 2-Month	2.12	-0.09	2.21	122nd Driest	Driest since: 1976	1931
Nov–Dec 1977 2-Month	2.12	-0.09	2.21	9th Wettest	Wettest since: 1972	1972
Oct–Dec 1977 3-Month	2.44	-0.02	2.46	127th Driest	Driest since: 1976	1930
Oct–Dec 1977 3-Month	2.44	-0.02	2.46	4th Wettest	Wettest to Date	1996
Sep–Dec 1977 4-Month	2.10	0.00	2.10	125th Driest	Driest since: 1976	2024
Sep–Dec 1977 4-Month	2.10	0.00	2.10	6th Wettest	Wettest since: 1907	2018
Aug–Dec 1977 5-Month	1.69	0.02	1.67	122nd Driest	Driest since: 1976	1930
Aug–Dec 1977 5-Month	1.69	0.02	1.67	9th Wettest	Wettest since: 1955	2011
Jul–Dec 1977 6-Month	1.28	0.01	1.27	119th Driest	Driest since: 1976	1930
Jul–Dec 1977 6-Month	1.28	0.01	1.27	12th Wettest	Wettest since: 1975	2018
Jun–Dec 1977 7-Month	1.15	0.02	1.13	111th Driest	Driest since: 1976	1930
Jun–Dec 1977 7-Month	1.15	0.02	1.13	20th Wettest	Wettest since: 1975	2018
May–Dec 1977 8-Month	0.68	-0.02	0.70	104th Driest	Driest since: 1974	1964
May–Dec 1977 8-Month	0.68	-0.02	0.70	27th Wettest	Wettest since: 1976	2018
Apr–Dec 1977 9-Month	0.69	-0.01	0.70	106th Driest	Driest since: 1976	1930
	0.69	-0.01	0.70	25th Wettest	Wettest since: 1975	2018
	Ties: 1901
Mar–Dec 1977 10-Month	0.99	0.00	0.99	120th Driest	Driest since: 1976	1930
Mar–Dec 1977 10-Month	0.99	0.00	0.99	11th Wettest	Wettest since: 1975	2011
Feb–Dec 1977 11-Month	0.84	0.02	0.82	115th Driest	Driest since: 1976	1930
Feb–Dec 1977 11-Month	0.84	0.02	0.82	16th Wettest	Wettest since: 1975	2018
Jan–Dec 1977 12-Month	0.61	0.03	0.58	110th Driest	Driest since: 1976	1930
Jan–Dec 1977 12-Month	0.61	0.03	0.58	21st Wettest	Wettest since: 1975	2018
Jul 1976–Dec 1977 18-Month	0.66	0.02	0.64	112th Driest	Driest since: 1974	1965
Jul 1976–Dec 1977 18-Month	0.66	0.02	0.64	18th Wettest	Wettest since: 1976	2019
Jan 1976–Dec 1977 24-Month	0.50	0.03	0.47	105th Driest	Driest since: 1974	1931
	0.50	0.03	0.47	25th Wettest	Wettest since: 1976	2019
	Ties: 1938
Jan 1975–Dec 1977 36-Month	0.74	0.03	0.71	121st Driest	Driest since: 1976	1965
Jan 1975–Dec 1977 36-Month	0.74	0.03	0.71	8th Wettest	Wettest since: 1953	2020
Jan 1974–Dec 1977 48-Month	0.62	0.03	0.59	119th Driest	Driest since: 1976	1966
Jan 1974–Dec 1977 48-Month	0.62	0.03	0.59	9th Wettest	Wettest since: 1975	2021
Jan 1973–Dec 1977 60-Month	0.59	0.03	0.56	118th Driest	Driest since: 1974	1966
	0.59	0.03	0.56	9th Wettest	Wettest since: 1976	1976, 1979, 2021
	Ties: 1907

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 28, 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 1977 Palmer Z-Index Rankings

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