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 4

December 1929 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1929 1-Month	-0.65	0.02	-0.67	47th Driest	Driest since: 1928	1998
December 1929 1-Month	-0.65	0.02	-0.67	84th Wettest	Wettest since: 1927	1983
Nov–Dec 1929 2-Month	0.00	-0.09	0.09	66th Driest	Driest since: 1928	1998
Nov–Dec 1929 2-Month	0.00	-0.09	0.09	65th Wettest	Wettest since: 1927	2018
Oct–Dec 1929 3-Month	1.27	-0.07	1.34	108th Driest	Driest since: 1928	2001
Oct–Dec 1929 3-Month	1.27	-0.07	1.34	23rd Wettest	Wettest since: 1927	2018
Sep–Dec 1929 4-Month	1.02	-0.01	1.03	102nd Driest	Driest since: 1928	1930
Sep–Dec 1929 4-Month	1.02	-0.01	1.03	29th Wettest	Wettest since: 1927	2018
Aug–Dec 1929 5-Month	0.56	0.03	0.53	88th Driest	Driest since: 1928	1930
Aug–Dec 1929 5-Month	0.56	0.03	0.53	43rd Wettest	Wettest since: 1927	2018
Jul–Dec 1929 6-Month	0.21	0.06	0.15	74th Driest	Driest since: 1928	1930
Jul–Dec 1929 6-Month	0.21	0.06	0.15	57th Wettest	Wettest since: 1927	2018
Jun–Dec 1929 7-Month	0.37	0.08	0.29	83rd Driest	Driest since: 1925	1930
Jun–Dec 1929 7-Month	0.37	0.08	0.29	48th Wettest	Wettest since: 1928	2018
May–Dec 1929 8-Month	0.42	0.04	0.38	83rd Driest	Driest since: 1926	1930
	0.42	0.04	0.38	48th Wettest	Wettest since: 1928	2018
	Ties: 1902
Apr–Dec 1929 9-Month	0.72	0.04	0.68	106th Driest	Driest since: 1926	1930
Apr–Dec 1929 9-Month	0.72	0.04	0.68	25th Wettest	Wettest since: 1928	2018
Mar–Dec 1929 10-Month	0.52	0.03	0.49	92nd Driest	Driest since: 1926	1930
Mar–Dec 1929 10-Month	0.52	0.03	0.49	39th Wettest	Wettest since: 1928	2018
Feb–Dec 1929 11-Month	0.52	0.04	0.48	94th Driest	Driest since: 1926	1930
Feb–Dec 1929 11-Month	0.52	0.04	0.48	37th Wettest	Wettest since: 1928	2018
Jan–Dec 1929 12-Month	0.53	0.06	0.47	98th Driest	Driest since: 1926	1930
Jan–Dec 1929 12-Month	0.53	0.06	0.47	33rd Wettest	Wettest since: 1928	2018
Jul 1928–Dec 1929 18-Month	0.40	0.05	0.35	88th Driest	Driest since: 1926	1931
	0.40	0.05	0.35	42nd Wettest	Wettest since: 1928	2018
	Ties: 1908
Jan 1928–Dec 1929 24-Month	0.65	0.05	0.60	113th Driest	Driest since: 1927	1931
Jan 1928–Dec 1929 24-Month	0.65	0.05	0.60	17th Wettest	Wettest since: 1928	2019
Jan 1927–Dec 1929 36-Month	0.68	0.05	0.63	120th Driest	Driest since: 1928	1965
Jan 1927–Dec 1929 36-Month	0.68	0.05	0.63	9th Wettest	Wettest since: 1907	2019
Jan 1926–Dec 1929 48-Month	0.55	0.05	0.50	116th Driest	Driest since: 1928	1966
Jan 1926–Dec 1929 48-Month	0.55	0.05	0.50	12th Wettest	Wettest since: 1907	1996
Jan 1925–Dec 1929 60-Month	0.36	0.06	0.30	102nd Driest	Driest since: 1927	1966
Jan 1925–Dec 1929 60-Month	0.36	0.06	0.30	25th Wettest	Wettest since: 1928	1996

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 4

December 1929 Palmer Z-Index Rankings

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