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 2018 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2018 1-Month	0.75	-0.08	0.83	89th Driest	Driest since: 2017	1930
December 2018 1-Month	0.75	-0.08	0.83	42nd Wettest	Wettest since: 2013	1901
Nov–Dec 2018 2-Month	2.49	-0.15	2.64	123rd Driest	Driest since: 2017	1930
Nov–Dec 2018 2-Month	2.49	-0.15	2.64	8th Wettest	Wettest since: 1996	1972
Oct–Dec 2018 3-Month	2.47	-0.09	2.56	126th Driest	Driest since: 2017	1930
Oct–Dec 2018 3-Month	2.47	-0.09	2.56	5th Wettest	Wettest since: 1996	1996
Sep–Dec 2018 4-Month	3.45	-0.04	3.49	129th Driest	Driest since: 2017	1964
Sep–Dec 2018 4-Month	3.45	-0.04	3.49	2nd Wettest	Wettest since: 2011	2011
Aug–Dec 2018 5-Month	4.19	-0.01	4.20	130th Driest	Driest since: 2017	1964
Aug–Dec 2018 5-Month	4.19	-0.01	4.20	1st Wettest	Wettest to Date	2018
Jul–Dec 2018 6-Month	4.51	0.01	4.50	130th Driest	Driest since: 2017	1964
Jul–Dec 2018 6-Month	4.51	0.01	4.50	1st Wettest	Wettest to Date	2018
Jun–Dec 2018 7-Month	3.74	0.03	3.71	130th Driest	Driest since: 2017	1964
Jun–Dec 2018 7-Month	3.74	0.03	3.71	1st Wettest	Wettest to Date	2018
May–Dec 2018 8-Month	3.46	0.01	3.45	130th Driest	Driest since: 2017	1964
May–Dec 2018 8-Month	3.46	0.01	3.45	1st Wettest	Wettest to Date	2018
Apr–Dec 2018 9-Month	3.14	0.03	3.11	130th Driest	Driest since: 2017	1964
Apr–Dec 2018 9-Month	3.14	0.03	3.11	1st Wettest	Wettest to Date	2018
Mar–Dec 2018 10-Month	2.81	0.02	2.79	129th Driest	Driest since: 2017	1964
Mar–Dec 2018 10-Month	2.81	0.02	2.79	2nd Wettest	Wettest since: 2011	2011
Feb–Dec 2018 11-Month	2.70	0.01	2.69	129th Driest	Driest since: 2017	1964
Feb–Dec 2018 11-Month	2.70	0.01	2.69	2nd Wettest	Wettest since: 2011	2011
Jan–Dec 2018 12-Month	2.57	0.03	2.54	130th Driest	Driest since: 2017	1991
	2.57	0.03	2.54	1st Wettest	Wettest since: 2011	2011, 2018
	Ties: 2011
Jul 2017–Dec 2018 18-Month	1.75	0.02	1.73	126th Driest	Driest since: 2017	1965
Jul 2017–Dec 2018 18-Month	1.75	0.02	1.73	4th Wettest	Wettest since: 2011	2019
Jan 2017–Dec 2018 24-Month	1.61	0.03	1.58	128th Driest	Driest since: 2017	1964
Jan 2017–Dec 2018 24-Month	1.61	0.03	1.58	2nd Wettest	Wettest to Date	2019
Jan 2016–Dec 2018 36-Month	0.89	0.03	0.86	121st Driest	Driest since: 2017	1965
	0.89	0.03	0.86	8th Wettest	Wettest since: 2013	2019
	Ties: 1903
Jan 2015–Dec 2018 48-Month	0.60	0.03	0.57	108th Driest	Driest since: 2017	1966
Jan 2015–Dec 2018 48-Month	0.60	0.03	0.57	20th Wettest	Wettest since: 2014	2006
Jan 2014–Dec 2018 60-Month	0.46	0.03	0.43	101st Driest	Driest since: 2017	1966
	0.46	0.03	0.43	26th Wettest	Wettest since: 2015	2021
	Ties: 1906, 2010

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 2018 Palmer Z-Index Rankings

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