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 1909 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1909 1-Month	-0.28	0.09	-0.37	57th Driest	Driest since: 1908	1955
December 1909 1-Month	-0.28	0.09	-0.37	74th Wettest	Wettest since: 1907	1996
Nov–Dec 1909 2-Month	-1.55	-0.09	-1.46	22nd Driest	Driest since: 1908	1931
Nov–Dec 1909 2-Month	-1.55	-0.09	-1.46	109th Wettest	Wettest since: 1907	1972
Oct–Dec 1909 3-Month	-1.59	-0.02	-1.57	14th Driest	Driest since: 1908	1930
Oct–Dec 1909 3-Month	-1.59	-0.02	-1.57	117th Wettest	Wettest since: 1907	1996
Sep–Dec 1909 4-Month	-1.46	0.00	-1.46	15th Driest	Driest since: 1908	2024
Sep–Dec 1909 4-Month	-1.46	0.00	-1.46	116th Wettest	Wettest since: 1907	2018
Aug–Dec 1909 5-Month	-1.77	0.02	-1.79	8th Driest	Driest since: 1900	1930
Aug–Dec 1909 5-Month	-1.77	0.02	-1.79	123rd Wettest	Wettest since: 1908	2011
Jul–Dec 1909 6-Month	-1.83	0.01	-1.84	5th Driest	Driest to Date	1930
Jul–Dec 1909 6-Month	-1.83	0.01	-1.84	126th Wettest	Wettest since: 1908	2018
Jun–Dec 1909 7-Month	-1.54	0.02	-1.56	6th Driest	Driest to Date	1930
Jun–Dec 1909 7-Month	-1.54	0.02	-1.56	125th Wettest	Wettest since: 1908	2018
May–Dec 1909 8-Month	-1.43	-0.02	-1.41	7th Driest	Driest to Date	1964
May–Dec 1909 8-Month	-1.43	-0.02	-1.41	124th Wettest	Wettest since: 1908	2018
Apr–Dec 1909 9-Month	-0.97	-0.01	-0.96	17th Driest	Driest since: 1908	1930
Apr–Dec 1909 9-Month	-0.97	-0.01	-0.96	114th Wettest	Wettest since: 1907	2018
Mar–Dec 1909 10-Month	-0.86	0.00	-0.86	16th Driest	Driest since: 1908	1930
	-0.86	0.00	-0.86	115th Wettest	Wettest since: 1908	2011
	Ties: 1908
Feb–Dec 1909 11-Month	-0.40	0.02	-0.42	30th Driest	Driest since: 1908	1930
Feb–Dec 1909 11-Month	-0.40	0.02	-0.42	101st Wettest	Wettest since: 1907	2018
Jan–Dec 1909 12-Month	-0.38	0.03	-0.41	29th Driest	Driest since: 1908	1930
Jan–Dec 1909 12-Month	-0.38	0.03	-0.41	102nd Wettest	Wettest since: 1907	2018
Jul 1908–Dec 1909 18-Month	-0.69	0.02	-0.71	13th Driest	Driest to Date	1965
Jul 1908–Dec 1909 18-Month	-0.69	0.02	-0.71	117th Wettest	Wettest since: 1908	2019
Jan 1908–Dec 1909 24-Month	-0.41	0.03	-0.44	17th Driest	Driest since: 1896	1931
Jan 1908–Dec 1909 24-Month	-0.41	0.03	-0.44	113th Wettest	Wettest since: 1908	2019
Jan 1907–Dec 1909 36-Month	0.00	0.03	-0.03	58th Driest	Driest since: 1901	1965
Jan 1907–Dec 1909 36-Month	0.00	0.03	-0.03	71st Wettest	Wettest since: 1908	2020
Jan 1906–Dec 1909 48-Month	0.14	0.03	0.11	73rd Driest	Driest since: 1901	1966
Jan 1906–Dec 1909 48-Month	0.14	0.03	0.11	55th Wettest	Wettest since: 1908	2021
Jan 1905–Dec 1909 60-Month	0.13	0.03	0.10	77th Driest	Driest since: 1901	1966
Jan 1905–Dec 1909 60-Month	0.13	0.03	0.10	50th Wettest	Wettest since: 1908	1976, 1979, 2021

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 22, 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 1909 Palmer Z-Index Rankings

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