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 3

October 2018 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 2018 1-Month	0.20	0.11	0.09	72nd Driest	Driest since: 2016	2024
October 2018 1-Month	0.20	0.11	0.09	59th Wettest	Wettest since: 2017	2005
Sep–Oct 2018 2-Month	2.44	0.10	2.34	118th Driest	Driest since: 2017	2024
Sep–Oct 2018 2-Month	2.44	0.10	2.34	13th Wettest	Wettest since: 2012	2011
Aug–Oct 2018 3-Month	3.17	0.10	3.07	128th Driest	Driest since: 2017	1930
Aug–Oct 2018 3-Month	3.17	0.10	3.07	3rd Wettest	Wettest since: 2011	2011
Jul–Oct 2018 4-Month	3.37	0.07	3.30	129th Driest	Driest since: 2017	1930
Jul–Oct 2018 4-Month	3.37	0.07	3.30	2nd Wettest	Wettest since: 2011	2011
Jun–Oct 2018 5-Month	2.87	0.07	2.80	130th Driest	Driest since: 2017	2024
Jun–Oct 2018 5-Month	2.87	0.07	2.80	1st Wettest	Wettest to Date	2018
May–Oct 2018 6-Month	2.57	0.00	2.57	130th Driest	Driest since: 2017	1964
May–Oct 2018 6-Month	2.57	0.00	2.57	1st Wettest	Wettest to Date	2018
Apr–Oct 2018 7-Month	2.32	0.01	2.31	130th Driest	Driest since: 2017	1963
Apr–Oct 2018 7-Month	2.32	0.01	2.31	1st Wettest	Wettest to Date	2018
Mar–Oct 2018 8-Month	2.05	0.01	2.04	129th Driest	Driest since: 2017	1930
Mar–Oct 2018 8-Month	2.05	0.01	2.04	2nd Wettest	Wettest since: 2011	2011
Feb–Oct 2018 9-Month	2.27	0.03	2.24	130th Driest	Driest since: 2017	1963
Feb–Oct 2018 9-Month	2.27	0.03	2.24	1st Wettest	Wettest to Date	2018
Jan–Oct 2018 10-Month	2.02	0.04	1.98	130th Driest	Driest since: 2017	1963
Jan–Oct 2018 10-Month	2.02	0.04	1.98	1st Wettest	Wettest to Date	2018
Dec 2017–Oct 2018 11-Month	1.69	0.04	1.65	128th Driest	Driest since: 2017	1963
Dec 2017–Oct 2018 11-Month	1.69	0.04	1.65	2nd Wettest	Wettest since: 1975	1975
Nov 2017–Oct 2018 12-Month	1.44	0.01	1.43	128th Driest	Driest since: 2017	2002
	1.44	0.01	1.43	2nd Wettest	Wettest since: 2003	2003
	Ties: 1975
May 2017–Oct 2018 18-Month	1.21	0.01	1.20	127th Driest	Driest since: 2017	1965
May 2017–Oct 2018 18-Month	1.21	0.01	1.20	3rd Wettest	Wettest since: 2004	2019
Nov 2016–Oct 2018 24-Month	0.60	0.01	0.59	112th Driest	Driest since: 2017	1966
Nov 2016–Oct 2018 24-Month	0.60	0.01	0.59	17th Wettest	Wettest since: 2004	2019
Nov 2015–Oct 2018 36-Month	0.12	0.01	0.11	69th Driest	Driest since: 2017	1965
Nov 2015–Oct 2018 36-Month	0.12	0.01	0.11	59th Wettest	Wettest since: 2015	1904
Nov 2014–Oct 2018 48-Month	0.08	0.02	0.06	69th Driest	Driest since: 2017	1966
	0.08	0.02	0.06	58th Wettest	Wettest since: 2015	2021
	Ties: 1937, 1990
Nov 2013–Oct 2018 60-Month	0.16	0.02	0.14	83rd Driest	Driest since: 2017	1966
	0.16	0.02	0.14	43rd Wettest	Wettest since: 2015	1906
	Ties: 2005

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on April 1, 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 3

October 2018 Palmer Z-Index Rankings

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