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 6

December 1947 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1947 1-Month	-1.71	-0.08	-1.63	20th Driest	Driest since: 1943	1930
December 1947 1-Month	-1.71	-0.08	-1.63	111th Wettest	Wettest since: 1946	1901
Nov–Dec 1947 2-Month	-0.76	-0.15	-0.61	37th Driest	Driest since: 1946	1930
Nov–Dec 1947 2-Month	-0.76	-0.15	-0.61	94th Wettest	Wettest since: 1945	1972
Oct–Dec 1947 3-Month	-1.52	-0.09	-1.43	18th Driest	Driest since: 1941	1930
Oct–Dec 1947 3-Month	-1.52	-0.09	-1.43	113th Wettest	Wettest since: 1946	1996
Sep–Dec 1947 4-Month	-1.31	-0.04	-1.27	18th Driest	Driest since: 1941	1964
Sep–Dec 1947 4-Month	-1.31	-0.04	-1.27	113th Wettest	Wettest since: 1946	2011
Aug–Dec 1947 5-Month	-0.92	-0.01	-0.91	22nd Driest	Driest since: 1941	1964
Aug–Dec 1947 5-Month	-0.92	-0.01	-0.91	109th Wettest	Wettest since: 1946	2018
Jul–Dec 1947 6-Month	0.04	0.01	0.03	61st Driest	Driest since: 1944	1964
Jul–Dec 1947 6-Month	0.04	0.01	0.03	70th Wettest	Wettest since: 1946	2018
Jun–Dec 1947 7-Month	0.02	0.03	-0.01	58th Driest	Driest since: 1944	1964
Jun–Dec 1947 7-Month	0.02	0.03	-0.01	73rd Wettest	Wettest since: 1946	2018
May–Dec 1947 8-Month	0.50	0.01	0.49	89th Driest	Driest since: 1944	1964
May–Dec 1947 8-Month	0.50	0.01	0.49	42nd Wettest	Wettest since: 1946	2018
Apr–Dec 1947 9-Month	0.74	0.03	0.71	101st Driest	Driest since: 1944	1964
Apr–Dec 1947 9-Month	0.74	0.03	0.71	30th Wettest	Wettest since: 1946	2018
Mar–Dec 1947 10-Month	0.65	0.02	0.63	101st Driest	Driest since: 1946	1964
Mar–Dec 1947 10-Month	0.65	0.02	0.63	30th Wettest	Wettest since: 1945	2011
Feb–Dec 1947 11-Month	0.41	0.01	0.40	89th Driest	Driest since: 1944	1964
Feb–Dec 1947 11-Month	0.41	0.01	0.40	42nd Wettest	Wettest since: 1946	2011
Jan–Dec 1947 12-Month	0.43	0.03	0.40	91st Driest	Driest since: 1946	1991
Jan–Dec 1947 12-Month	0.43	0.03	0.40	40th Wettest	Wettest since: 1945	2011, 2018
Jul 1946–Dec 1947 18-Month	0.42	0.02	0.40	88th Driest	Driest since: 1945	1965
Jul 1946–Dec 1947 18-Month	0.42	0.02	0.40	42nd Wettest	Wettest since: 1946	2019
Jan 1946–Dec 1947 24-Month	0.33	0.03	0.30	84th Driest	Driest since: 1945	1964
Jan 1946–Dec 1947 24-Month	0.33	0.03	0.30	46th Wettest	Wettest since: 1946	2019
Jan 1945–Dec 1947 36-Month	0.54	0.03	0.51	105th Driest	Driest since: 1946	1965
Jan 1945–Dec 1947 36-Month	0.54	0.03	0.51	24th Wettest	Wettest since: 1904	2019
Jan 1944–Dec 1947 48-Month	0.29	0.03	0.26	86th Driest	Driest since: 1946	1966
	0.29	0.03	0.26	42nd Wettest	Wettest since: 1929	2006
	Ties: 1915
Jan 1943–Dec 1947 60-Month	0.22	0.03	0.19	77th Driest	Driest since: 1946	1966
Jan 1943–Dec 1947 60-Month	0.22	0.03	0.19	50th Wettest	Wettest since: 1929	2021

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 6

December 1947 Palmer Z-Index Rankings

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