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 3

October 1956 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1956 1-Month	1.01	0.11	0.90	86th Driest	Driest since: 1954	2024
October 1956 1-Month	1.01	0.11	0.90	45th Wettest	Wettest since: 1955	2005
Sep–Oct 1956 2-Month	0.89	0.10	0.79	88th Driest	Driest since: 1954	2024
Sep–Oct 1956 2-Month	0.89	0.10	0.79	43rd Wettest	Wettest since: 1955	2011
Aug–Oct 1956 3-Month	0.60	0.10	0.50	85th Driest	Driest since: 1954	1930
Aug–Oct 1956 3-Month	0.60	0.10	0.50	46th Wettest	Wettest since: 1955	2011
Jul–Oct 1956 4-Month	0.85	0.07	0.78	91st Driest	Driest since: 1954	1930
Jul–Oct 1956 4-Month	0.85	0.07	0.78	40th Wettest	Wettest since: 1955	2011
Jun–Oct 1956 5-Month	0.73	0.07	0.66	90th Driest	Driest since: 1954	2024
Jun–Oct 1956 5-Month	0.73	0.07	0.66	41st Wettest	Wettest since: 1955	2018
May–Oct 1956 6-Month	0.45	0.00	0.45	86th Driest	Driest since: 1954	1964
May–Oct 1956 6-Month	0.45	0.00	0.45	45th Wettest	Wettest since: 1955	2018
Apr–Oct 1956 7-Month	0.32	0.01	0.31	81st Driest	Driest since: 1954	1963
Apr–Oct 1956 7-Month	0.32	0.01	0.31	50th Wettest	Wettest since: 1955	2018
Mar–Oct 1956 8-Month	0.49	0.01	0.48	91st Driest	Driest since: 1954	1930
Mar–Oct 1956 8-Month	0.49	0.01	0.48	40th Wettest	Wettest since: 1955	2011
Feb–Oct 1956 9-Month	0.66	0.03	0.63	102nd Driest	Driest since: 1955	1963
Feb–Oct 1956 9-Month	0.66	0.03	0.63	29th Wettest	Wettest since: 1952	2018
Jan–Oct 1956 10-Month	0.47	0.04	0.43	93rd Driest	Driest since: 1955	1963
Jan–Oct 1956 10-Month	0.47	0.04	0.43	38th Wettest	Wettest since: 1952	2018
Dec 1955–Oct 1956 11-Month	0.15	0.04	0.11	71st Driest	Driest since: 1954	1963
Dec 1955–Oct 1956 11-Month	0.15	0.04	0.11	59th Wettest	Wettest since: 1955	1975
Nov 1955–Oct 1956 12-Month	0.03	0.01	0.02	65th Driest	Driest since: 1954	2002
Nov 1955–Oct 1956 12-Month	0.03	0.01	0.02	65th Wettest	Wettest since: 1955	2003
May 1955–Oct 1956 18-Month	0.31	0.01	0.30	82nd Driest	Driest since: 1955	1965
	0.31	0.01	0.30	48th Wettest	Wettest since: 1953	2019
	Ties: 1916
Nov 1954–Oct 1956 24-Month	0.10	0.01	0.09	70th Driest	Driest since: 1955	1966
Nov 1954–Oct 1956 24-Month	0.10	0.01	0.09	59th Wettest	Wettest since: 1953	2019
Nov 1953–Oct 1956 36-Month	-0.24	0.01	-0.25	30th Driest	Driest since: 1943	1965
Nov 1953–Oct 1956 36-Month	-0.24	0.01	-0.25	98th Wettest	Wettest since: 1955	1904
Nov 1952–Oct 1956 48-Month	-0.05	0.02	-0.07	42nd Driest	Driest since: 1950	1966
Nov 1952–Oct 1956 48-Month	-0.05	0.02	-0.07	85th Wettest	Wettest since: 1955	2021
Nov 1951–Oct 1956 60-Month	0.18	0.02	0.16	86th Driest	Driest since: 1954	1966
Nov 1951–Oct 1956 60-Month	0.18	0.02	0.16	40th Wettest	Wettest since: 1955	1906

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on April 1, 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 3

October 1956 Palmer Z-Index Rankings

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