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 1

December 1970 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1970 1-Month	-0.37	0.04	-0.41	53rd Driest	Driest since: 1965	1998
December 1970 1-Month	-0.37	0.04	-0.41	78th Wettest	Wettest since: 1969	1973
Nov–Dec 1970 2-Month	0.36	-0.11	0.47	86th Driest	Driest since: 1967	1931
	0.36	-0.11	0.47	45th Wettest	Wettest since: 1969	1972
	Ties: 1934
Oct–Dec 1970 3-Month	0.43	-0.05	0.48	79th Driest	Driest since: 1968	1931
Oct–Dec 1970 3-Month	0.43	-0.05	0.48	52nd Wettest	Wettest since: 1969	1927
Sep–Dec 1970 4-Month	-0.01	-0.02	0.01	58th Driest	Driest since: 1967	1931
Sep–Dec 1970 4-Month	-0.01	-0.02	0.01	73rd Wettest	Wettest since: 1969	2018
Aug–Dec 1970 5-Month	-0.21	-0.02	-0.19	53rd Driest	Driest since: 1968	1964
Aug–Dec 1970 5-Month	-0.21	-0.02	-0.19	78th Wettest	Wettest since: 1969	2011
Jul–Dec 1970 6-Month	-0.20	-0.03	-0.17	57th Driest	Driest since: 1968	1964
Jul–Dec 1970 6-Month	-0.20	-0.03	-0.17	74th Wettest	Wettest since: 1969	2018
Jun–Dec 1970 7-Month	-0.33	-0.01	-0.32	47th Driest	Driest since: 1968	1964
Jun–Dec 1970 7-Month	-0.33	-0.01	-0.32	84th Wettest	Wettest since: 1969	2011
May–Dec 1970 8-Month	-0.43	-0.04	-0.39	40th Driest	Driest since: 1966	1964
May–Dec 1970 8-Month	-0.43	-0.04	-0.39	91st Wettest	Wettest since: 1969	2011
Apr–Dec 1970 9-Month	-0.38	-0.04	-0.34	42nd Driest	Driest since: 1966	1964
Apr–Dec 1970 9-Month	-0.38	-0.04	-0.34	89th Wettest	Wettest since: 1969	2011
Mar–Dec 1970 10-Month	-0.32	-0.03	-0.29	39th Driest	Driest since: 1966	1964
Mar–Dec 1970 10-Month	-0.32	-0.03	-0.29	92nd Wettest	Wettest since: 1969	2011
Feb–Dec 1970 11-Month	-0.26	-0.02	-0.24	44th Driest	Driest since: 1968	1964
Feb–Dec 1970 11-Month	-0.26	-0.02	-0.24	87th Wettest	Wettest since: 1969	2011
Jan–Dec 1970 12-Month	-0.46	-0.01	-0.45	29th Driest	Driest since: 1968	1964
Jan–Dec 1970 12-Month	-0.46	-0.01	-0.45	102nd Wettest	Wettest since: 1969	2011
Jul 1969–Dec 1970 18-Month	-0.03	-0.02	-0.01	54th Driest	Driest since: 1969	1965
Jul 1969–Dec 1970 18-Month	-0.03	-0.02	-0.01	76th Wettest	Wettest since: 1961	2011
Jan 1969–Dec 1970 24-Month	-0.25	-0.02	-0.23	39th Driest	Driest since: 1969	1964, 1965
Jan 1969–Dec 1970 24-Month	-0.25	-0.02	-0.23	91st Wettest	Wettest since: 1961	2019
Jan 1968–Dec 1970 36-Month	-0.34	-0.02	-0.32	21st Driest	Driest since: 1968	1965
Jan 1968–Dec 1970 36-Month	-0.34	-0.02	-0.32	108th Wettest	Wettest since: 1969	2019
Jan 1967–Dec 1970 48-Month	-0.25	-0.01	-0.24	25th Driest	Driest since: 1969	1966
Jan 1967–Dec 1970 48-Month	-0.25	-0.01	-0.24	103rd Wettest	Wettest since: 1962	2021
Jan 1966–Dec 1970 60-Month	-0.36	-0.01	-0.35	12th Driest	Driest since: 1969	1966
	-0.36	-0.01	-0.35	115th Wettest	Wettest since: 1963	1976, 2022
	Ties: 1932

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 1

December 1970 Palmer Z-Index Rankings

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