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 6

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	-2.13	-0.08	-2.05	11th Driest	Driest since: 1908	1930
December 1909 1-Month	-2.13	-0.08	-2.05	120th Wettest	Wettest since: 1907	1901
Nov–Dec 1909 2-Month	-3.21	-0.15	-3.06	4th Driest	Driest since: 1908	1930
Nov–Dec 1909 2-Month	-3.21	-0.15	-3.06	127th Wettest	Wettest since: 1907	1972
Oct–Dec 1909 3-Month	-2.58	-0.09	-2.49	5th Driest	Driest since: 1908	1930
Oct–Dec 1909 3-Month	-2.58	-0.09	-2.49	126th Wettest	Wettest since: 1907	1996
Sep–Dec 1909 4-Month	-2.37	-0.04	-2.33	5th Driest	Driest since: 1908	1964
Sep–Dec 1909 4-Month	-2.37	-0.04	-2.33	126th Wettest	Wettest since: 1907	2011
Aug–Dec 1909 5-Month	-2.22	-0.01	-2.21	5th Driest	Driest since: 1908	1964
Aug–Dec 1909 5-Month	-2.22	-0.01	-2.21	126th Wettest	Wettest since: 1907	2018
Jul–Dec 1909 6-Month	-2.30	0.01	-2.31	3rd Driest	Driest to Date	1964
Jul–Dec 1909 6-Month	-2.30	0.01	-2.31	128th Wettest	Wettest since: 1908	2018
Jun–Dec 1909 7-Month	-1.85	0.03	-1.88	5th Driest	Driest since: 1908	1964
Jun–Dec 1909 7-Month	-1.85	0.03	-1.88	126th Wettest	Wettest since: 1907	2018
May–Dec 1909 8-Month	-1.73	0.01	-1.74	5th Driest	Driest since: 1908	1964
May–Dec 1909 8-Month	-1.73	0.01	-1.74	126th Wettest	Wettest since: 1907	2018
Apr–Dec 1909 9-Month	-1.27	0.03	-1.30	9th Driest	Driest since: 1908	1964
Apr–Dec 1909 9-Month	-1.27	0.03	-1.30	122nd Wettest	Wettest since: 1907	2018
Mar–Dec 1909 10-Month	-1.21	0.02	-1.23	7th Driest	Driest since: 1908	1964
Mar–Dec 1909 10-Month	-1.21	0.02	-1.23	124th Wettest	Wettest since: 1907	2011
Feb–Dec 1909 11-Month	-0.91	0.01	-0.92	15th Driest	Driest since: 1908	1964
Feb–Dec 1909 11-Month	-0.91	0.01	-0.92	116th Wettest	Wettest since: 1907	2011
Jan–Dec 1909 12-Month	-0.84	0.03	-0.87	13th Driest	Driest since: 1908	1991
Jan–Dec 1909 12-Month	-0.84	0.03	-0.87	118th Wettest	Wettest since: 1907	2011, 2018
Jul 1908–Dec 1909 18-Month	-1.31	0.02	-1.33	4th Driest	Driest to Date	1965
Jul 1908–Dec 1909 18-Month	-1.31	0.02	-1.33	126th Wettest	Wettest since: 1908	2019
Jan 1908–Dec 1909 24-Month	-0.87	0.03	-0.90	4th Driest	Driest to Date	1964
Jan 1908–Dec 1909 24-Month	-0.87	0.03	-0.90	126th Wettest	Wettest since: 1908	2019
Jan 1907–Dec 1909 36-Month	-0.51	0.03	-0.54	12th Driest	Driest to Date	1965
Jan 1907–Dec 1909 36-Month	-0.51	0.03	-0.54	117th Wettest	Wettest since: 1908	2019
Jan 1906–Dec 1909 48-Month	-0.34	0.03	-0.37	20th Driest	Driest to Date	1966
Jan 1906–Dec 1909 48-Month	-0.34	0.03	-0.37	108th Wettest	Wettest since: 1908	2006
Jan 1905–Dec 1909 60-Month	-0.28	0.03	-0.31	21st Driest	Driest to Date	1966
Jan 1905–Dec 1909 60-Month	-0.28	0.03	-0.31	106th Wettest	Wettest since: 1908	2021

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 6

December 1909 Palmer Z-Index Rankings

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