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 2006 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 2006 1-Month	-1.54	0.04	-1.58	22nd Driest	Driest since: 1998	1998
December 2006 1-Month	-1.54	0.04	-1.58	109th Wettest	Wettest since: 2005	1973
Nov–Dec 2006 2-Month	-0.13	-0.11	-0.02	68th Driest	Driest since: 2001	1931
Nov–Dec 2006 2-Month	-0.13	-0.11	-0.02	63rd Wettest	Wettest since: 2005	1972
Oct–Dec 2006 3-Month	0.68	-0.05	0.73	90th Driest	Driest since: 2004	1931
Oct–Dec 2006 3-Month	0.68	-0.05	0.73	41st Wettest	Wettest since: 2005	1927
Sep–Dec 2006 4-Month	0.99	-0.02	1.01	106th Driest	Driest since: 2001	1931
Sep–Dec 2006 4-Month	0.99	-0.02	1.01	25th Wettest	Wettest since: 2005	2018
Aug–Dec 2006 5-Month	1.03	-0.02	1.05	111th Driest	Driest since: 2005	1964
Aug–Dec 2006 5-Month	1.03	-0.02	1.05	20th Wettest	Wettest since: 2004	2011
Jul–Dec 2006 6-Month	0.74	-0.03	0.77	102nd Driest	Driest since: 2005	1964
	0.74	-0.03	0.77	29th Wettest	Wettest since: 2004	2018
	Ties: 1919, 1938
Jun–Dec 2006 7-Month	1.72	-0.01	1.73	122nd Driest	Driest since: 2005	1964
Jun–Dec 2006 7-Month	1.72	-0.01	1.73	9th Wettest	Wettest since: 2003	2011
May–Dec 2006 8-Month	1.41	-0.04	1.45	121st Driest	Driest since: 2005	1964
May–Dec 2006 8-Month	1.41	-0.04	1.45	10th Wettest	Wettest since: 2004	2011
Apr–Dec 2006 9-Month	1.25	-0.04	1.29	121st Driest	Driest since: 2005	1964
Apr–Dec 2006 9-Month	1.25	-0.04	1.29	10th Wettest	Wettest since: 2004	2011
Mar–Dec 2006 10-Month	0.87	-0.03	0.90	114th Driest	Driest since: 2005	1964
Mar–Dec 2006 10-Month	0.87	-0.03	0.90	17th Wettest	Wettest since: 2004	2011
Feb–Dec 2006 11-Month	0.68	-0.02	0.70	109th Driest	Driest since: 2005	1964
Feb–Dec 2006 11-Month	0.68	-0.02	0.70	22nd Wettest	Wettest since: 2004	2011
Jan–Dec 2006 12-Month	0.89	-0.01	0.90	120th Driest	Driest since: 2005	1964
Jan–Dec 2006 12-Month	0.89	-0.01	0.90	11th Wettest	Wettest since: 2003	2011
Jul 2005–Dec 2006 18-Month	0.61	-0.02	0.63	105th Driest	Driest since: 2002	1965
	0.61	-0.02	0.63	25th Wettest	Wettest since: 2005	2011
	Ties: 1973
Jan 2005–Dec 2006 24-Month	0.51	-0.02	0.53	104th Driest	Driest since: 2005	1964, 1965
Jan 2005–Dec 2006 24-Month	0.51	-0.02	0.53	26th Wettest	Wettest since: 2004	2019
Jan 2004–Dec 2006 36-Month	0.58	-0.02	0.60	111th Driest	Driest since: 2003	1965
Jan 2004–Dec 2006 36-Month	0.58	-0.02	0.60	18th Wettest	Wettest since: 2005	2019
Jan 2003–Dec 2006 48-Month	0.78	-0.01	0.79	125th Driest	Driest since: 2005	1966
Jan 2003–Dec 2006 48-Month	0.78	-0.01	0.79	3rd Wettest	Wettest since: 1975	2021
Jan 2002–Dec 2006 60-Month	0.67	-0.01	0.68	122nd Driest	Driest since: 2005	1966
Jan 2002–Dec 2006 60-Month	0.67	-0.01	0.68	5th Wettest	Wettest since: 1976	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 2006 Palmer Z-Index Rankings

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