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 1951 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1951 1-Month	-0.55	0.11	-0.66	53rd Driest	Driest since: 1950	2024
October 1951 1-Month	-0.55	0.11	-0.66	78th Wettest	Wettest since: 1946	2005
Sep–Oct 1951 2-Month	-0.83	0.10	-0.93	41st Driest	Driest since: 1949	2024
Sep–Oct 1951 2-Month	-0.83	0.10	-0.93	90th Wettest	Wettest since: 1950	2011
Aug–Oct 1951 3-Month	-1.04	0.10	-1.14	30th Driest	Driest since: 1949	1930
Aug–Oct 1951 3-Month	-1.04	0.10	-1.14	101st Wettest	Wettest since: 1950	2011
Jul–Oct 1951 4-Month	-0.84	0.07	-0.91	30th Driest	Driest since: 1949	1930
Jul–Oct 1951 4-Month	-0.84	0.07	-0.91	101st Wettest	Wettest since: 1950	2011
Jun–Oct 1951 5-Month	-0.34	0.07	-0.41	47th Driest	Driest since: 1949	2024
	-0.34	0.07	-0.41	84th Wettest	Wettest since: 1950	2018
	Ties: 1939
May–Oct 1951 6-Month	-0.47	0.00	-0.47	39th Driest	Driest since: 1949	1964
May–Oct 1951 6-Month	-0.47	0.00	-0.47	92nd Wettest	Wettest since: 1950	2018
Apr–Oct 1951 7-Month	-0.50	0.01	-0.51	35th Driest	Driest since: 1949	1963
Apr–Oct 1951 7-Month	-0.50	0.01	-0.51	96th Wettest	Wettest since: 1950	2018
Mar–Oct 1951 8-Month	-0.40	0.01	-0.41	38th Driest	Driest since: 1949	1930
Mar–Oct 1951 8-Month	-0.40	0.01	-0.41	93rd Wettest	Wettest since: 1950	2011
Feb–Oct 1951 9-Month	-0.17	0.03	-0.20	48th Driest	Driest since: 1949	1963
Feb–Oct 1951 9-Month	-0.17	0.03	-0.20	83rd Wettest	Wettest since: 1950	2018
Jan–Oct 1951 10-Month	-0.10	0.04	-0.14	51st Driest	Driest since: 1949	1963
	-0.10	0.04	-0.14	80th Wettest	Wettest since: 1950	2018
	Ties: 1916
Dec 1950–Oct 1951 11-Month	-0.01	0.04	-0.05	57th Driest	Driest since: 1950	1963
Dec 1950–Oct 1951 11-Month	-0.01	0.04	-0.05	73rd Wettest	Wettest since: 1948	1975
Nov 1950–Oct 1951 12-Month	0.16	0.01	0.15	75th Driest	Driest since: 1950	2002
Nov 1950–Oct 1951 12-Month	0.16	0.01	0.15	55th Wettest	Wettest since: 1948	2003
May 1950–Oct 1951 18-Month	0.08	0.01	0.07	66th Driest	Driest since: 1950	1965
	0.08	0.01	0.07	64th Wettest	Wettest since: 1948	2019
	Ties: 1917
Nov 1949–Oct 1951 24-Month	-0.09	0.01	-0.10	48th Driest	Driest since: 1950	1966
Nov 1949–Oct 1951 24-Month	-0.09	0.01	-0.10	81st Wettest	Wettest since: 1949	2019
Nov 1948–Oct 1951 36-Month	-0.15	0.01	-0.16	38th Driest	Driest since: 1943	1965
Nov 1948–Oct 1951 36-Month	-0.15	0.01	-0.16	90th Wettest	Wettest since: 1950	1904
Nov 1947–Oct 1951 48-Month	-0.02	0.02	-0.04	48th Driest	Driest since: 1950	1966
Nov 1947–Oct 1951 48-Month	-0.02	0.02	-0.04	79th Wettest	Wettest since: 1949	2021
Nov 1946–Oct 1951 60-Month	-0.08	0.02	-0.10	35th Driest	Driest since: 1945	1966
Nov 1946–Oct 1951 60-Month	-0.08	0.02	-0.10	91st Wettest	Wettest since: 1950	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 1951 Palmer Z-Index Rankings

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