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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 1971 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1971 1-Month	-1.50	0.09	-1.59	19th Driest	Driest since: 1965	1955
December 1971 1-Month	-1.50	0.09	-1.59	112th Wettest	Wettest since: 1970	1996
Nov–Dec 1971 2-Month	0.42	-0.09	0.51	87th Driest	Driest since: 1968	1931
Nov–Dec 1971 2-Month	0.42	-0.09	0.51	44th Wettest	Wettest since: 1970	1972
Oct–Dec 1971 3-Month	0.14	-0.02	0.16	65th Driest	Driest since: 1968	1930
Oct–Dec 1971 3-Month	0.14	-0.02	0.16	66th Wettest	Wettest since: 1970	1996
Sep–Dec 1971 4-Month	0.24	0.00	0.24	69th Driest	Driest since: 1968	2024
Sep–Dec 1971 4-Month	0.24	0.00	0.24	62nd Wettest	Wettest since: 1970	2018
Aug–Dec 1971 5-Month	0.86	0.02	0.84	103rd Driest	Driest since: 1970	1930
	0.86	0.02	0.84	28th Wettest	Wettest since: 1955	2011
	Ties: 1945
Jul–Dec 1971 6-Month	0.75	0.01	0.74	99th Driest	Driest since: 1970	1930
Jul–Dec 1971 6-Month	0.75	0.01	0.74	32nd Wettest	Wettest since: 1969	2018
Jun–Dec 1971 7-Month	0.30	0.02	0.28	79th Driest	Driest since: 1970	1930
Jun–Dec 1971 7-Month	0.30	0.02	0.28	52nd Wettest	Wettest since: 1969	2018
May–Dec 1971 8-Month	0.40	-0.02	0.42	87th Driest	Driest since: 1970	1964
May–Dec 1971 8-Month	0.40	-0.02	0.42	44th Wettest	Wettest since: 1969	2018
Apr–Dec 1971 9-Month	0.09	-0.01	0.10	70th Driest	Driest since: 1970	1930
	0.09	-0.01	0.10	61st Wettest	Wettest since: 1969	2018
	Ties: 1924
Mar–Dec 1971 10-Month	0.05	0.00	0.05	66th Driest	Driest since: 1970	1930
Mar–Dec 1971 10-Month	0.05	0.00	0.05	65th Wettest	Wettest since: 1969	2011
Feb–Dec 1971 11-Month	0.37	0.02	0.35	91st Driest	Driest since: 1970	1930
Feb–Dec 1971 11-Month	0.37	0.02	0.35	40th Wettest	Wettest since: 1956	2018
Jan–Dec 1971 12-Month	0.29	0.03	0.26	83rd Driest	Driest since: 1970	1930
Jan–Dec 1971 12-Month	0.29	0.03	0.26	48th Wettest	Wettest since: 1960	2018
Jul 1970–Dec 1971 18-Month	0.25	0.02	0.23	83rd Driest	Driest since: 1970	1965
Jul 1970–Dec 1971 18-Month	0.25	0.02	0.23	47th Wettest	Wettest since: 1960	2019
Jan 1970–Dec 1971 24-Month	0.04	0.03	0.01	63rd Driest	Driest since: 1970	1931
Jan 1970–Dec 1971 24-Month	0.04	0.03	0.01	67th Wettest	Wettest since: 1961	2019
Jan 1969–Dec 1971 36-Month	0.01	0.03	-0.02	59th Driest	Driest since: 1970	1965
Jan 1969–Dec 1971 36-Month	0.01	0.03	-0.02	70th Wettest	Wettest since: 1960	2020
Jan 1968–Dec 1971 48-Month	-0.15	0.03	-0.18	31st Driest	Driest since: 1970	1966
Jan 1968–Dec 1971 48-Month	-0.15	0.03	-0.18	97th Wettest	Wettest since: 1962	2021
Jan 1967–Dec 1971 60-Month	-0.13	0.03	-0.16	28th Driest	Driest since: 1970	1966
Jan 1967–Dec 1971 60-Month	-0.13	0.03	-0.16	99th Wettest	Wettest since: 1962	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 1971 Palmer Z-Index Rankings

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