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

October 2021 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 2021 1-Month	0.51	0.14	0.37	78th Driest	Driest since: 2020	2024
October 2021 1-Month	0.51	0.14	0.37	53rd Wettest	Wettest since: 2019	2005
Sep–Oct 2021 2-Month	2.80	0.10	2.70	124th Driest	Driest since: 2020	2024
Sep–Oct 2021 2-Month	2.80	0.10	2.70	7th Wettest	Wettest since: 2011	2011
Aug–Oct 2021 3-Month	2.72	0.09	2.63	125th Driest	Driest since: 2020	1930
Aug–Oct 2021 3-Month	2.72	0.09	2.63	6th Wettest	Wettest since: 2018	2011
Jul–Oct 2021 4-Month	2.22	0.05	2.17	123rd Driest	Driest since: 2020	1964
Jul–Oct 2021 4-Month	2.22	0.05	2.17	8th Wettest	Wettest since: 2018	2011
Jun–Oct 2021 5-Month	1.45	0.07	1.38	111th Driest	Driest since: 2020	1930, 2024
Jun–Oct 2021 5-Month	1.45	0.07	1.38	20th Wettest	Wettest since: 2018	2003
May–Oct 2021 6-Month	1.21	0.00	1.21	115th Driest	Driest since: 2020	1964
May–Oct 2021 6-Month	1.21	0.00	1.21	16th Wettest	Wettest since: 2018	2011
Apr–Oct 2021 7-Month	0.71	0.01	0.70	105th Driest	Driest since: 2020	1963
Apr–Oct 2021 7-Month	0.71	0.01	0.70	26th Wettest	Wettest since: 2019	2011
Mar–Oct 2021 8-Month	0.58	0.03	0.55	96th Driest	Driest since: 2020	1963
	0.58	0.03	0.55	35th Wettest	Wettest since: 2019	2011
	Ties: 1960
Feb–Oct 2021 9-Month	0.75	0.04	0.71	111th Driest	Driest since: 2020	1941
Feb–Oct 2021 9-Month	0.75	0.04	0.71	20th Wettest	Wettest since: 2019	2011
Jan–Oct 2021 10-Month	0.54	0.06	0.48	99th Driest	Driest since: 2020	1963
	0.54	0.06	0.48	32nd Wettest	Wettest since: 2019	2011
	Ties: 1951
Dec 2020–Oct 2021 11-Month	0.70	0.06	0.64	105th Driest	Driest since: 2020	1963
	0.70	0.06	0.64	25th Wettest	Wettest since: 2019	2011
	Ties: 2009
Nov 2020–Oct 2021 12-Month	0.57	0.03	0.54	104th Driest	Driest since: 2020	1930
Nov 2020–Oct 2021 12-Month	0.57	0.03	0.54	26th Wettest	Wettest since: 2019	2011
May 2020–Oct 2021 18-Month	0.49	0.02	0.47	99th Driest	Driest since: 2020	1965
May 2020–Oct 2021 18-Month	0.49	0.02	0.47	31st Wettest	Wettest since: 2019	2019
Nov 2019–Oct 2021 24-Month	0.33	0.03	0.30	94th Driest	Driest since: 2017	1966
	0.33	0.03	0.30	35th Wettest	Wettest since: 2020	2019
	Ties: 1899, 1920
Nov 2018–Oct 2021 36-Month	0.68	0.03	0.65	117th Driest	Driest since: 2018	1965, 1966
Nov 2018–Oct 2021 36-Month	0.68	0.03	0.65	11th Wettest	Wettest since: 2020	2019
Nov 2017–Oct 2021 48-Month	0.88	0.03	0.85	126th Driest	Driest since: 2020	1966
Nov 2017–Oct 2021 48-Month	0.88	0.03	0.85	1st Wettest	Wettest to Date	2021
Nov 2016–Oct 2021 60-Month	0.72	0.03	0.69	124th Driest	Driest since: 2020	1966
	0.72	0.03	0.69	2nd Wettest	Wettest since: 1979	1976
	Ties: 1975, 1979

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on April 2, 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

October 2021 Palmer Z-Index Rankings

Citing This Page

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