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 1909 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1909 1-Month	-1.68	0.14	-1.82	22nd Driest	Driest since: 1900	2024
October 1909 1-Month	-1.68	0.14	-1.82	109th Wettest	Wettest since: 1908	2005
Sep–Oct 1909 2-Month	-1.37	0.10	-1.47	21st Driest	Driest since: 1908	2024
Sep–Oct 1909 2-Month	-1.37	0.10	-1.47	110th Wettest	Wettest since: 1907	2011
Aug–Oct 1909 3-Month	-1.91	0.09	-2.00	8th Driest	Driest since: 1900	1930
Aug–Oct 1909 3-Month	-1.91	0.09	-2.00	123rd Wettest	Wettest since: 1908	2011
Jul–Oct 1909 4-Month	-1.98	0.05	-2.03	6th Driest	Driest to Date	1964
Jul–Oct 1909 4-Month	-1.98	0.05	-2.03	125th Wettest	Wettest since: 1908	2011
Jun–Oct 1909 5-Month	-1.53	0.07	-1.60	8th Driest	Driest to Date	1930, 2024
Jun–Oct 1909 5-Month	-1.53	0.07	-1.60	123rd Wettest	Wettest since: 1908	2003
May–Oct 1909 6-Month	-1.39	0.00	-1.39	12th Driest	Driest to Date	1964
May–Oct 1909 6-Month	-1.39	0.00	-1.39	119th Wettest	Wettest since: 1908	2011
Apr–Oct 1909 7-Month	-0.81	0.01	-0.82	23rd Driest	Driest since: 1900	1963
Apr–Oct 1909 7-Month	-0.81	0.01	-0.82	108th Wettest	Wettest since: 1908	2011
Mar–Oct 1909 8-Month	-0.69	0.03	-0.72	21st Driest	Driest since: 1900	1963
Mar–Oct 1909 8-Month	-0.69	0.03	-0.72	110th Wettest	Wettest since: 1908	2011
Feb–Oct 1909 9-Month	-0.15	0.04	-0.19	47th Driest	Driest since: 1900	1941
Feb–Oct 1909 9-Month	-0.15	0.04	-0.19	84th Wettest	Wettest since: 1908	2011
Jan–Oct 1909 10-Month	-0.14	0.06	-0.20	45th Driest	Driest since: 1900	1963
Jan–Oct 1909 10-Month	-0.14	0.06	-0.20	86th Wettest	Wettest since: 1908	2011
Dec 1908–Oct 1909 11-Month	-0.26	0.06	-0.32	36th Driest	Driest since: 1900	1963
Dec 1908–Oct 1909 11-Month	-0.26	0.06	-0.32	94th Wettest	Wettest since: 1908	2011
Nov 1908–Oct 1909 12-Month	-0.50	0.03	-0.53	25th Driest	Driest since: 1900	1930
Nov 1908–Oct 1909 12-Month	-0.50	0.03	-0.53	105th Wettest	Wettest since: 1908	2011
May 1908–Oct 1909 18-Month	-0.58	0.02	-0.60	16th Driest	Driest to Date	1965
May 1908–Oct 1909 18-Month	-0.58	0.02	-0.60	114th Wettest	Wettest since: 1908	2019
Nov 1907–Oct 1909 24-Month	-0.12	0.03	-0.15	45th Driest	Driest since: 1901	1966
Nov 1907–Oct 1909 24-Month	-0.12	0.03	-0.15	84th Wettest	Wettest since: 1908	2019
Nov 1906–Oct 1909 36-Month	0.09	0.03	0.06	69th Driest	Driest since: 1901	1965, 1966
Nov 1906–Oct 1909 36-Month	0.09	0.03	0.06	59th Wettest	Wettest since: 1908	2019
Nov 1905–Oct 1909 48-Month	0.19	0.03	0.16	85th Driest	Driest since: 1901	1966
Nov 1905–Oct 1909 48-Month	0.19	0.03	0.16	42nd Wettest	Wettest since: 1908	2021
Nov 1904–Oct 1909 60-Month	0.15	0.03	0.12	79th Driest	Driest since: 1901	1966
Nov 1904–Oct 1909 60-Month	0.15	0.03	0.12	47th Wettest	Wettest since: 1908	1976

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 2

October 1909 Palmer Z-Index Rankings

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