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 2

October 1964 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1964 1-Month	-2.83	0.14	-2.97	5th Driest	Driest since: 1963	2024
October 1964 1-Month	-2.83	0.14	-2.97	126th Wettest	Wettest since: 1962	2005
Sep–Oct 1964 2-Month	-2.40	0.10	-2.50	7th Driest	Driest since: 1961	2024
Sep–Oct 1964 2-Month	-2.40	0.10	-2.50	124th Wettest	Wettest since: 1963	2011
Aug–Oct 1964 3-Month	-2.67	0.09	-2.76	2nd Driest	Driest since: 1930	1930
Aug–Oct 1964 3-Month	-2.67	0.09	-2.76	129th Wettest	Wettest since: 1963	2011
Jul–Oct 1964 4-Month	-2.52	0.05	-2.57	1st Driest	Driest to Date	1964
Jul–Oct 1964 4-Month	-2.52	0.05	-2.57	130th Wettest	Wettest since: 1963	2011
Jun–Oct 1964 5-Month	-2.12	0.07	-2.19	3rd Driest	Driest since: 1930	1930, 2024
Jun–Oct 1964 5-Month	-2.12	0.07	-2.19	128th Wettest	Wettest since: 1963	2003
May–Oct 1964 6-Month	-2.26	0.00	-2.26	1st Driest	Driest to Date	1964
May–Oct 1964 6-Month	-2.26	0.00	-2.26	130th Wettest	Wettest since: 1963	2011
Apr–Oct 1964 7-Month	-1.55	0.01	-1.56	4th Driest	Driest since: 1963	1963
Apr–Oct 1964 7-Month	-1.55	0.01	-1.56	127th Wettest	Wettest since: 1962	2011
Mar–Oct 1964 8-Month	-1.53	0.03	-1.56	3rd Driest	Driest since: 1963	1963
	-1.53	0.03	-1.56	128th Wettest	Wettest since: 1962	2011
	Ties: 1930
Feb–Oct 1964 9-Month	-1.35	0.04	-1.39	5th Driest	Driest since: 1963	1941
Feb–Oct 1964 9-Month	-1.35	0.04	-1.39	126th Wettest	Wettest since: 1962	2011
Jan–Oct 1964 10-Month	-1.04	0.06	-1.10	9th Driest	Driest since: 1963	1963
Jan–Oct 1964 10-Month	-1.04	0.06	-1.10	122nd Wettest	Wettest since: 1962	2011
Dec 1963–Oct 1964 11-Month	-1.05	0.06	-1.11	7th Driest	Driest since: 1963	1963
Dec 1963–Oct 1964 11-Month	-1.05	0.06	-1.11	123rd Wettest	Wettest since: 1962	2011
Nov 1963–Oct 1964 12-Month	-0.86	0.03	-0.89	11th Driest	Driest since: 1963	1930
	-0.86	0.03	-0.89	119th Wettest	Wettest since: 1962	2011
	Ties: 1932
May 1963–Oct 1964 18-Month	-1.14	0.02	-1.16	4th Driest	Driest since: 1931	1965
May 1963–Oct 1964 18-Month	-1.14	0.02	-1.16	126th Wettest	Wettest since: 1963	2019
Nov 1962–Oct 1964 24-Month	-1.05	0.03	-1.08	4th Driest	Driest since: 1931	1966
Nov 1962–Oct 1964 24-Month	-1.05	0.03	-1.08	125th Wettest	Wettest since: 1963	2019
Nov 1961–Oct 1964 36-Month	-0.82	0.03	-0.85	6th Driest	Driest since: 1932	1965, 1966
Nov 1961–Oct 1964 36-Month	-0.82	0.03	-0.85	122nd Wettest	Wettest since: 1963	2019
Nov 1960–Oct 1964 48-Month	-0.71	0.03	-0.74	6th Driest	Driest since: 1932	1966
Nov 1960–Oct 1964 48-Month	-0.71	0.03	-0.74	121st Wettest	Wettest since: 1963	2021
Nov 1959–Oct 1964 60-Month	-0.44	0.03	-0.47	8th Driest	Driest since: 1934	1966
	-0.44	0.03	-0.47	118th Wettest	Wettest since: 1963	1976
	Ties: 1934

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 2

October 1964 Palmer Z-Index Rankings

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