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 2004 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2004 1-Month	1.22	-0.08	1.30	98th Driest	Driest since: 2001	1930
December 2004 1-Month	1.22	-0.08	1.30	33rd Wettest	Wettest since: 2003	1901
Nov–Dec 2004 2-Month	0.88	-0.15	1.03	96th Driest	Driest since: 2001	1930
Nov–Dec 2004 2-Month	0.88	-0.15	1.03	35th Wettest	Wettest since: 2003	1972
Oct–Dec 2004 3-Month	0.61	-0.09	0.70	88th Driest	Driest since: 2001	1930
Oct–Dec 2004 3-Month	0.61	-0.09	0.70	43rd Wettest	Wettest since: 2003	1996
Sep–Dec 2004 4-Month	2.20	-0.04	2.24	124th Driest	Driest since: 2002	1964
Sep–Dec 2004 4-Month	2.20	-0.04	2.24	7th Wettest	Wettest since: 2003	2011
Aug–Dec 2004 5-Month	2.43	-0.01	2.44	127th Driest	Driest since: 2003	1964
Aug–Dec 2004 5-Month	2.43	-0.01	2.44	4th Wettest	Wettest since: 1977	2018
Jul–Dec 2004 6-Month	3.20	0.01	3.19	129th Driest	Driest since: 2003	1964
Jul–Dec 2004 6-Month	3.20	0.01	3.19	2nd Wettest	Wettest to Date	2018
Jun–Dec 2004 7-Month	2.72	0.03	2.69	129th Driest	Driest since: 2003	1964
Jun–Dec 2004 7-Month	2.72	0.03	2.69	2nd Wettest	Wettest to Date	2018
May–Dec 2004 8-Month	2.52	0.01	2.51	129th Driest	Driest since: 2003	1964
May–Dec 2004 8-Month	2.52	0.01	2.51	2nd Wettest	Wettest to Date	2018
Apr–Dec 2004 9-Month	2.31	0.03	2.28	128th Driest	Driest since: 2003	1964
Apr–Dec 2004 9-Month	2.31	0.03	2.28	3rd Wettest	Wettest to Date	2018
Mar–Dec 2004 10-Month	1.91	0.02	1.89	128th Driest	Driest since: 2003	1964
Mar–Dec 2004 10-Month	1.91	0.02	1.89	3rd Wettest	Wettest to Date	2011
Feb–Dec 2004 11-Month	1.65	0.01	1.64	128th Driest	Driest since: 2003	1964
	1.65	0.01	1.64	3rd Wettest	Wettest since: 1972	2011
	Ties: 1972
Jan–Dec 2004 12-Month	1.55	0.03	1.52	127th Driest	Driest since: 2003	1991
Jan–Dec 2004 12-Month	1.55	0.03	1.52	4th Wettest	Wettest since: 1996	2011, 2018
Jul 2003–Dec 2004 18-Month	1.79	0.02	1.77	127th Driest	Driest since: 2003	1965
Jul 2003–Dec 2004 18-Month	1.79	0.02	1.77	3rd Wettest	Wettest to Date	2019
Jan 2003–Dec 2004 24-Month	1.48	0.03	1.45	127th Driest	Driest since: 2003	1964
Jan 2003–Dec 2004 24-Month	1.48	0.03	1.45	3rd Wettest	Wettest to Date	2019
Jan 2002–Dec 2004 36-Month	1.09	0.03	1.06	125th Driest	Driest since: 2003	1965
Jan 2002–Dec 2004 36-Month	1.09	0.03	1.06	4th Wettest	Wettest to Date	2019
Jan 2001–Dec 2004 48-Month	0.75	0.03	0.72	117th Driest	Driest since: 2003	1966
	0.75	0.03	0.72	11th Wettest	Wettest since: 1996	2006
	Ties: 1904, 1996
Jan 2000–Dec 2004 60-Month	0.67	0.03	0.64	111th Driest	Driest since: 2003	1966
Jan 2000–Dec 2004 60-Month	0.67	0.03	0.64	16th Wettest	Wettest since: 1996	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 2004 Palmer Z-Index Rankings

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