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 6

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	0.35	-0.08	0.43	76th Driest	Driest since: 1968	1930
December 1970 1-Month	0.35	-0.08	0.43	55th Wettest	Wettest since: 1969	1901
Nov–Dec 1970 2-Month	0.72	-0.15	0.87	93rd Driest	Driest since: 1967	1930
Nov–Dec 1970 2-Month	0.72	-0.15	0.87	38th Wettest	Wettest since: 1969	1972
Oct–Dec 1970 3-Month	0.84	-0.09	0.93	92nd Driest	Driest since: 1968	1930
Oct–Dec 1970 3-Month	0.84	-0.09	0.93	39th Wettest	Wettest since: 1969	1996
Sep–Dec 1970 4-Month	0.53	-0.04	0.57	83rd Driest	Driest since: 1969	1964
	0.53	-0.04	0.57	48th Wettest	Wettest since: 1969	2011
	Ties: 1898, 1903, 1969
Aug–Dec 1970 5-Month	0.43	-0.01	0.44	81st Driest	Driest since: 1969	1964
Aug–Dec 1970 5-Month	0.43	-0.01	0.44	50th Wettest	Wettest since: 1967	2018
Jul–Dec 1970 6-Month	0.63	0.01	0.62	90th Driest	Driest since: 1969	1964
Jul–Dec 1970 6-Month	0.63	0.01	0.62	41st Wettest	Wettest since: 1967	2018
Jun–Dec 1970 7-Month	0.33	0.03	0.30	78th Driest	Driest since: 1968	1964
Jun–Dec 1970 7-Month	0.33	0.03	0.30	53rd Wettest	Wettest since: 1969	2018
May–Dec 1970 8-Month	0.22	0.01	0.21	72nd Driest	Driest since: 1966	1964
May–Dec 1970 8-Month	0.22	0.01	0.21	59th Wettest	Wettest since: 1969	2018
Apr–Dec 1970 9-Month	0.13	0.03	0.10	60th Driest	Driest since: 1968	1964
	0.13	0.03	0.10	71st Wettest	Wettest since: 1969	2018
	Ties: 1940
Mar–Dec 1970 10-Month	0.06	0.02	0.04	59th Driest	Driest since: 1969	1964
Mar–Dec 1970 10-Month	0.06	0.02	0.04	72nd Wettest	Wettest since: 1967	2011
Feb–Dec 1970 11-Month	0.11	0.01	0.10	67th Driest	Driest since: 1969	1964
Feb–Dec 1970 11-Month	0.11	0.01	0.10	64th Wettest	Wettest since: 1967	2011
Jan–Dec 1970 12-Month	-0.10	0.03	-0.13	50th Driest	Driest since: 1969	1991
Jan–Dec 1970 12-Month	-0.10	0.03	-0.13	81st Wettest	Wettest since: 1967	2011, 2018
Jul 1969–Dec 1970 18-Month	0.11	0.02	0.09	57th Driest	Driest since: 1969	1965
Jul 1969–Dec 1970 18-Month	0.11	0.02	0.09	73rd Wettest	Wettest since: 1968	2019
Jan 1969–Dec 1970 24-Month	-0.20	0.03	-0.23	38th Driest	Driest since: 1969	1964
Jan 1969–Dec 1970 24-Month	-0.20	0.03	-0.23	92nd Wettest	Wettest since: 1968	2019
Jan 1968–Dec 1970 36-Month	-0.24	0.03	-0.27	27th Driest	Driest since: 1967	1965
Jan 1968–Dec 1970 36-Month	-0.24	0.03	-0.27	102nd Wettest	Wettest since: 1969	2019
Jan 1967–Dec 1970 48-Month	-0.03	0.03	-0.06	50th Driest	Driest since: 1969	1966
Jan 1967–Dec 1970 48-Month	-0.03	0.03	-0.06	78th Wettest	Wettest since: 1961	2006
Jan 1966–Dec 1970 60-Month	-0.17	0.03	-0.20	32nd Driest	Driest since: 1969	1966
Jan 1966–Dec 1970 60-Month	-0.17	0.03	-0.20	95th Wettest	Wettest since: 1962	2021

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 6

December 1970 Palmer Z-Index Rankings

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