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

December 1904 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1904 1-Month	-0.27	0.09	-0.36	58th Driest	Driest since: 1900	1955
December 1904 1-Month	-0.27	0.09	-0.36	73rd Wettest	Wettest since: 1903	1996
Nov–Dec 1904 2-Month	-0.95	-0.09	-0.86	36th Driest	Driest since: 1900	1931
Nov–Dec 1904 2-Month	-0.95	-0.09	-0.86	95th Wettest	Wettest since: 1903	1972
Oct–Dec 1904 3-Month	-0.26	-0.02	-0.24	53rd Driest	Driest since: 1900	1930
Oct–Dec 1904 3-Month	-0.26	-0.02	-0.24	78th Wettest	Wettest since: 1903	1996
Sep–Dec 1904 4-Month	0.15	0.00	0.15	64th Driest	Driest since: 1900	2024
Sep–Dec 1904 4-Month	0.15	0.00	0.15	67th Wettest	Wettest since: 1903	2018
Aug–Dec 1904 5-Month	0.93	0.02	0.91	107th Driest	Driest since: 1903	1930
Aug–Dec 1904 5-Month	0.93	0.02	0.91	24th Wettest	Wettest since: 1902	2011
Jul–Dec 1904 6-Month	0.94	0.01	0.93	108th Driest	Driest since: 1903	1930
	0.94	0.01	0.93	23rd Wettest	Wettest since: 1903	2018
	Ties: 1903
Jun–Dec 1904 7-Month	0.87	0.02	0.85	107th Driest	Driest since: 1901	1930
Jun–Dec 1904 7-Month	0.87	0.02	0.85	24th Wettest	Wettest since: 1903	2018
May–Dec 1904 8-Month	0.69	-0.02	0.71	106th Driest	Driest since: 1901	1964
May–Dec 1904 8-Month	0.69	-0.02	0.71	25th Wettest	Wettest since: 1903	2018
Apr–Dec 1904 9-Month	0.56	-0.01	0.57	100th Driest	Driest since: 1900	1930
Apr–Dec 1904 9-Month	0.56	-0.01	0.57	31st Wettest	Wettest since: 1903	2018
Mar–Dec 1904 10-Month	0.56	0.00	0.56	100th Driest	Driest since: 1900	1930
Mar–Dec 1904 10-Month	0.56	0.00	0.56	31st Wettest	Wettest since: 1903	2011
Feb–Dec 1904 11-Month	0.45	0.02	0.43	97th Driest	Driest since: 1900	1930
Feb–Dec 1904 11-Month	0.45	0.02	0.43	34th Wettest	Wettest since: 1903	2018
Jan–Dec 1904 12-Month	0.48	0.03	0.45	101st Driest	Driest since: 1901	1930
Jan–Dec 1904 12-Month	0.48	0.03	0.45	30th Wettest	Wettest since: 1903	2018
Jul 1903–Dec 1904 18-Month	0.63	0.02	0.61	111th Driest	Driest since: 1901	1965
Jul 1903–Dec 1904 18-Month	0.63	0.02	0.61	19th Wettest	Wettest since: 1903	2019
Jan 1903–Dec 1904 24-Month	0.75	0.03	0.72	119th Driest	Driest since: 1902	1931
Jan 1903–Dec 1904 24-Month	0.75	0.03	0.72	11th Wettest	Wettest since: 1903	2019
Jan 1902–Dec 1904 36-Month	0.85	0.03	0.82	125th Driest	Driest since: 1903	1965
Jan 1902–Dec 1904 36-Month	0.85	0.03	0.82	4th Wettest	Wettest to Date	2020
Jan 1901–Dec 1904 48-Month	0.74	0.03	0.71	122nd Driest	Driest since: 1903	1966
Jan 1901–Dec 1904 48-Month	0.74	0.03	0.71	6th Wettest	Wettest to Date	2021
Jan 1900–Dec 1904 60-Month	0.45	0.03	0.42	110th Driest	Driest since: 1903	1966
Jan 1900–Dec 1904 60-Month	0.45	0.03	0.42	17th Wettest	Wettest to Date	1976, 1979, 2021

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 24, 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

December 1904 Palmer Z-Index Rankings

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