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 1964 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1964 1-Month	-0.98	0.04	-1.02	35th Driest	Driest since: 1963	1998
December 1964 1-Month	-0.98	0.04	-1.02	96th Wettest	Wettest since: 1962	1973
Nov–Dec 1964 2-Month	-2.26	-0.11	-2.15	5th Driest	Driest since: 1939	1931
	-2.26	-0.11	-2.15	126th Wettest	Wettest since: 1963	1972
	Ties: 1928
Oct–Dec 1964 3-Month	-2.53	-0.05	-2.48	2nd Driest	Driest since: 1931	1931
Oct–Dec 1964 3-Month	-2.53	-0.05	-2.48	129th Wettest	Wettest since: 1963	1927
Sep–Dec 1964 4-Month	-2.56	-0.02	-2.54	2nd Driest	Driest since: 1931	1931
Sep–Dec 1964 4-Month	-2.56	-0.02	-2.54	129th Wettest	Wettest since: 1963	2018
Aug–Dec 1964 5-Month	-2.70	-0.02	-2.68	1st Driest	Driest to Date	1964
Aug–Dec 1964 5-Month	-2.70	-0.02	-2.68	130th Wettest	Wettest since: 1963	2011
Jul–Dec 1964 6-Month	-2.65	-0.03	-2.62	1st Driest	Driest to Date	1964
Jul–Dec 1964 6-Month	-2.65	-0.03	-2.62	130th Wettest	Wettest since: 1963	2018
Jun–Dec 1964 7-Month	-2.44	-0.01	-2.43	1st Driest	Driest to Date	1964
Jun–Dec 1964 7-Month	-2.44	-0.01	-2.43	130th Wettest	Wettest since: 1963	2011
May–Dec 1964 8-Month	-2.48	-0.04	-2.44	1st Driest	Driest to Date	1964
May–Dec 1964 8-Month	-2.48	-0.04	-2.44	130th Wettest	Wettest since: 1963	2011
Apr–Dec 1964 9-Month	-2.04	-0.04	-2.00	1st Driest	Driest to Date	1964
Apr–Dec 1964 9-Month	-2.04	-0.04	-2.00	130th Wettest	Wettest since: 1963	2011
Mar–Dec 1964 10-Month	-1.89	-0.03	-1.86	1st Driest	Driest to Date	1964
Mar–Dec 1964 10-Month	-1.89	-0.03	-1.86	130th Wettest	Wettest since: 1963	2011
Feb–Dec 1964 11-Month	-1.73	-0.02	-1.71	1st Driest	Driest to Date	1964
Feb–Dec 1964 11-Month	-1.73	-0.02	-1.71	130th Wettest	Wettest since: 1963	2011
Jan–Dec 1964 12-Month	-1.44	-0.01	-1.43	1st Driest	Driest to Date	1964
Jan–Dec 1964 12-Month	-1.44	-0.01	-1.43	130th Wettest	Wettest since: 1963	2011
Jul 1963–Dec 1964 18-Month	-1.34	-0.02	-1.32	2nd Driest	Driest to Date	1965
Jul 1963–Dec 1964 18-Month	-1.34	-0.02	-1.32	128th Wettest	Wettest since: 1963	2011
Jan 1963–Dec 1964 24-Month	-1.27	-0.02	-1.25	1st Driest	Driest to Date	1964, 1965
Jan 1963–Dec 1964 24-Month	-1.27	-0.02	-1.25	129th Wettest	Wettest since: 1963	2019
Jan 1962–Dec 1964 36-Month	-1.05	-0.02	-1.03	3rd Driest	Driest to Date	1965
Jan 1962–Dec 1964 36-Month	-1.05	-0.02	-1.03	126th Wettest	Wettest since: 1963	2019
Jan 1961–Dec 1964 48-Month	-0.84	-0.01	-0.83	3rd Driest	Driest to Date	1966
Jan 1961–Dec 1964 48-Month	-0.84	-0.01	-0.83	125th Wettest	Wettest since: 1963	2021
Jan 1960–Dec 1964 60-Month	-0.60	-0.01	-0.59	5th Driest	Driest to Date	1966
Jan 1960–Dec 1964 60-Month	-0.60	-0.01	-0.59	122nd Wettest	Wettest since: 1963	1976, 2022

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 1964 Palmer Z-Index Rankings

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