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 1

December 1897 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1897 1-Month	1.99	0.04	1.95	110th Driest	Driest since: 1896	1998
December 1897 1-Month	1.99	0.04	1.95	21st Wettest	Wettest to Date	1973
Nov–Dec 1897 2-Month	1.72	-0.11	1.83	117th Driest	Driest since: 1896	1931
Nov–Dec 1897 2-Month	1.72	-0.11	1.83	14th Wettest	Wettest to Date	1972
Oct–Dec 1897 3-Month	0.45	-0.05	0.50	83rd Driest	Driest since: 1896	1931
Oct–Dec 1897 3-Month	0.45	-0.05	0.50	48th Wettest	Wettest to Date	1927
Sep–Dec 1897 4-Month	0.02	-0.02	0.04	59th Driest	Driest since: 1896	1931
Sep–Dec 1897 4-Month	0.02	-0.02	0.04	72nd Wettest	Wettest to Date	2018
Aug–Dec 1897 5-Month	-0.03	-0.02	-0.01	56th Driest	Driest since: 1896	1964
Aug–Dec 1897 5-Month	-0.03	-0.02	-0.01	75th Wettest	Wettest to Date	2011
Jul–Dec 1897 6-Month	0.36	-0.03	0.39	80th Driest	Driest since: 1896	1964
Jul–Dec 1897 6-Month	0.36	-0.03	0.39	51st Wettest	Wettest to Date	2018
Jun–Dec 1897 7-Month	0.33	-0.01	0.34	81st Driest	Driest since: 1896	1964
Jun–Dec 1897 7-Month	0.33	-0.01	0.34	50th Wettest	Wettest to Date	2011
May–Dec 1897 8-Month	0.53	-0.04	0.57	96th Driest	Driest since: 1896	1964
May–Dec 1897 8-Month	0.53	-0.04	0.57	35th Wettest	Wettest to Date	2011
Apr–Dec 1897 9-Month	0.43	-0.04	0.47	90th Driest	Driest since: 1896	1964
Apr–Dec 1897 9-Month	0.43	-0.04	0.47	41st Wettest	Wettest to Date	2011
Mar–Dec 1897 10-Month	0.44	-0.03	0.47	93rd Driest	Driest since: 1896	1964
Mar–Dec 1897 10-Month	0.44	-0.03	0.47	38th Wettest	Wettest to Date	2011
Feb–Dec 1897 11-Month	0.39	-0.02	0.41	92nd Driest	Driest since: 1896	1964
Feb–Dec 1897 11-Month	0.39	-0.02	0.41	39th Wettest	Wettest to Date	2011
Jan–Dec 1897 12-Month	0.27	-0.01	0.28	85th Driest	Driest since: 1896	1964
Jan–Dec 1897 12-Month	0.27	-0.01	0.28	46th Wettest	Wettest to Date	2011
Jul 1896–Dec 1897 18-Month	0.17	-0.02	0.19	80th Driest	Driest since: 1896	1965
Jul 1896–Dec 1897 18-Month	0.17	-0.02	0.19	50th Wettest	Wettest to Date	2011
Jan 1896–Dec 1897 24-Month	0.13	-0.02	0.15	74th Driest	Driest since: 1896	1964, 1965
Jan 1896–Dec 1897 24-Month	0.13	-0.02	0.15	56th Wettest	Wettest to Date	2019
Jan 1895–Dec 1897 36-Month	-0.10	-0.02	-0.08	45th Driest	Driest to Date	1965
Jan 1895–Dec 1897 36-Month	-0.10	-0.02	-0.08	84th Wettest	Wettest to Date	2019

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 1

December 1897 Palmer Z-Index Rankings

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