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 2009 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2009 1-Month	2.04	0.09	1.95	110th Driest	Driest since: 2007	1955
December 2009 1-Month	2.04	0.09	1.95	21st Wettest	Wettest since: 2008	1996
Nov–Dec 2009 2-Month	-0.22	-0.09	-0.13	59th Driest	Driest since: 2001	1931
	-0.22	-0.09	-0.13	72nd Wettest	Wettest since: 2008	1972
	Ties: 1944
Oct–Dec 2009 3-Month	0.79	-0.02	0.81	97th Driest	Driest since: 2006	1930
Oct–Dec 2009 3-Month	0.79	-0.02	0.81	34th Wettest	Wettest since: 2008	1996
Sep–Dec 2009 4-Month	0.51	0.00	0.51	86th Driest	Driest since: 2007	2024
	0.51	0.00	0.51	45th Wettest	Wettest since: 2008	2018
	Ties: 1929
Aug–Dec 2009 5-Month	1.09	0.02	1.07	112th Driest	Driest since: 2008	1930
Aug–Dec 2009 5-Month	1.09	0.02	1.07	19th Wettest	Wettest since: 2004	2011
Jul–Dec 2009 6-Month	1.14	0.01	1.13	116th Driest	Driest since: 2008	1930
	1.14	0.01	1.13	15th Wettest	Wettest since: 2004	2018
	Ties: 1902
Jun–Dec 2009 7-Month	1.36	0.02	1.34	114th Driest	Driest since: 2008	1930
Jun–Dec 2009 7-Month	1.36	0.02	1.34	17th Wettest	Wettest since: 2006	2018
May–Dec 2009 8-Month	1.32	-0.02	1.34	120th Driest	Driest since: 2008	1964
	1.32	-0.02	1.34	11th Wettest	Wettest since: 2006	2018
	Ties: 1907
Apr–Dec 2009 9-Month	1.07	-0.01	1.08	119th Driest	Driest since: 2008	1930
	1.07	-0.01	1.08	12th Wettest	Wettest since: 2006	2018
	Ties: 1983
Mar–Dec 2009 10-Month	0.72	0.00	0.72	107th Driest	Driest since: 2008	1930
Mar–Dec 2009 10-Month	0.72	0.00	0.72	24th Wettest	Wettest since: 2006	2011
Feb–Dec 2009 11-Month	0.41	0.02	0.39	95th Driest	Driest since: 2007	1930
	0.41	0.02	0.39	36th Wettest	Wettest since: 2008	2018
	Ties: 1926, 1973
Jan–Dec 2009 12-Month	0.29	0.03	0.26	83rd Driest	Driest since: 2008	1930
	0.29	0.03	0.26	48th Wettest	Wettest since: 2008	2018
	Ties: 1971, 2008
Jul 2008–Dec 2009 18-Month	0.27	0.02	0.25	85th Driest	Driest since: 2008	1965
	0.27	0.02	0.25	45th Wettest	Wettest since: 2007	2019
	Ties: 1913
Jan 2008–Dec 2009 24-Month	0.29	0.03	0.26	93rd Driest	Driest since: 2008	1931
	0.29	0.03	0.26	37th Wettest	Wettest since: 2007	2019
	Ties: 1948, 1993
Jan 2007–Dec 2009 36-Month	0.23	0.03	0.20	84th Driest	Driest since: 2003	1965
	0.23	0.03	0.20	45th Wettest	Wettest since: 2008	2020
	Ties: 1912
Jan 2006–Dec 2009 48-Month	0.37	0.03	0.34	102nd Driest	Driest since: 2008	1966
Jan 2006–Dec 2009 48-Month	0.37	0.03	0.34	26th Wettest	Wettest since: 2007	2021
Jan 2005–Dec 2009 60-Month	0.31	0.03	0.28	99th Driest	Driest since: 2005	1966
Jan 2005–Dec 2009 60-Month	0.31	0.03	0.28	28th Wettest	Wettest since: 2008	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 2009 Palmer Z-Index Rankings

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