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 1921 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1921 1-Month	-0.77	0.04	-0.81	43rd Driest	Driest since: 1919	1998
December 1921 1-Month	-0.77	0.04	-0.81	88th Wettest	Wettest since: 1920	1973
Nov–Dec 1921 2-Month	0.53	-0.11	0.64	92nd Driest	Driest since: 1918	1931
Nov–Dec 1921 2-Month	0.53	-0.11	0.64	39th Wettest	Wettest since: 1920	1972
Oct–Dec 1921 3-Month	0.01	-0.05	0.06	63rd Driest	Driest since: 1918	1931
Oct–Dec 1921 3-Month	0.01	-0.05	0.06	68th Wettest	Wettest since: 1920	1927
Sep–Dec 1921 4-Month	-0.30	-0.02	-0.28	44th Driest	Driest since: 1917	1931
Sep–Dec 1921 4-Month	-0.30	-0.02	-0.28	87th Wettest	Wettest since: 1920	2018
Aug–Dec 1921 5-Month	-0.37	-0.02	-0.35	50th Driest	Driest since: 1918	1964
Aug–Dec 1921 5-Month	-0.37	-0.02	-0.35	81st Wettest	Wettest since: 1920	2011
Jul–Dec 1921 6-Month	-0.29	-0.03	-0.26	50th Driest	Driest since: 1918	1964
Jul–Dec 1921 6-Month	-0.29	-0.03	-0.26	81st Wettest	Wettest since: 1920	2018
Jun–Dec 1921 7-Month	-0.45	-0.01	-0.44	41st Driest	Driest since: 1914	1964
Jun–Dec 1921 7-Month	-0.45	-0.01	-0.44	90th Wettest	Wettest since: 1920	2011
May–Dec 1921 8-Month	-0.45	-0.04	-0.41	39th Driest	Driest since: 1914	1964
May–Dec 1921 8-Month	-0.45	-0.04	-0.41	92nd Wettest	Wettest since: 1920	2011
Apr–Dec 1921 9-Month	-0.56	-0.04	-0.52	30th Driest	Driest since: 1910	1964
Apr–Dec 1921 9-Month	-0.56	-0.04	-0.52	101st Wettest	Wettest since: 1920	2011
Mar–Dec 1921 10-Month	-0.65	-0.03	-0.62	23rd Driest	Driest since: 1910	1964
Mar–Dec 1921 10-Month	-0.65	-0.03	-0.62	108th Wettest	Wettest since: 1920	2011
Feb–Dec 1921 11-Month	-0.53	-0.02	-0.51	27th Driest	Driest since: 1910	1964
Feb–Dec 1921 11-Month	-0.53	-0.02	-0.51	104th Wettest	Wettest since: 1920	2011
Jan–Dec 1921 12-Month	-0.56	-0.01	-0.55	23rd Driest	Driest since: 1910	1964
Jan–Dec 1921 12-Month	-0.56	-0.01	-0.55	108th Wettest	Wettest since: 1920	2011
Jul 1920–Dec 1921 18-Month	0.01	-0.02	0.03	61st Driest	Driest since: 1919	1965
	0.01	-0.02	0.03	69th Wettest	Wettest since: 1920	2011
	Ties: 1906
Jan 1920–Dec 1921 24-Month	0.14	-0.02	0.16	76th Driest	Driest since: 1919	1964, 1965
Jan 1920–Dec 1921 24-Month	0.14	-0.02	0.16	54th Wettest	Wettest since: 1920	2019
Jan 1919–Dec 1921 36-Month	0.17	-0.02	0.19	79th Driest	Driest since: 1919	1965
Jan 1919–Dec 1921 36-Month	0.17	-0.02	0.19	50th Wettest	Wettest since: 1920	2019
Jan 1918–Dec 1921 48-Month	0.06	-0.01	0.07	66th Driest	Driest since: 1919	1966
Jan 1918–Dec 1921 48-Month	0.06	-0.01	0.07	62nd Wettest	Wettest since: 1920	2021
Jan 1917–Dec 1921 60-Month	-0.03	-0.01	-0.02	50th Driest	Driest since: 1919	1966
Jan 1917–Dec 1921 60-Month	-0.03	-0.01	-0.02	77th Wettest	Wettest since: 1920	1976, 2022

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 1921 Palmer Z-Index Rankings

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