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 3

October 1999 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1999 1-Month	0.76	0.11	0.65	80th Driest	Driest since: 1998	2024
October 1999 1-Month	0.76	0.11	0.65	51st Wettest	Wettest since: 1996	2005
Sep–Oct 1999 2-Month	3.57	0.10	3.47	128th Driest	Driest since: 1998	2024
Sep–Oct 1999 2-Month	3.57	0.10	3.47	3rd Wettest	Wettest to Date	2011
Aug–Oct 1999 3-Month	2.04	0.10	1.94	113th Driest	Driest since: 1998	1930
Aug–Oct 1999 3-Month	2.04	0.10	1.94	18th Wettest	Wettest since: 1979	2011
Jul–Oct 1999 4-Month	0.39	0.07	0.32	83rd Driest	Driest since: 1998	1930
	0.39	0.07	0.32	48th Wettest	Wettest since: 1996	2011
	Ties: 1925, 1985
Jun–Oct 1999 5-Month	-0.22	0.07	-0.29	53rd Driest	Driest since: 1998	2024
Jun–Oct 1999 5-Month	-0.22	0.07	-0.29	78th Wettest	Wettest since: 1996	2018
May–Oct 1999 6-Month	-0.48	0.00	-0.48	38th Driest	Driest since: 1998	1964
May–Oct 1999 6-Month	-0.48	0.00	-0.48	93rd Wettest	Wettest since: 1996	2018
Apr–Oct 1999 7-Month	-0.50	0.01	-0.51	35th Driest	Driest since: 1997	1963
	-0.50	0.01	-0.51	96th Wettest	Wettest since: 1998	2018
	Ties: 1939, 1951
Mar–Oct 1999 8-Month	-0.37	0.01	-0.38	40th Driest	Driest since: 1997	1930
Mar–Oct 1999 8-Month	-0.37	0.01	-0.38	91st Wettest	Wettest since: 1998	2011
Feb–Oct 1999 9-Month	-0.33	0.03	-0.36	40th Driest	Driest since: 1997	1963
	-0.33	0.03	-0.36	91st Wettest	Wettest since: 1998	2018
	Ties: 1900, 1910
Jan–Oct 1999 10-Month	-0.05	0.04	-0.09	57th Driest	Driest since: 1997	1963
Jan–Oct 1999 10-Month	-0.05	0.04	-0.09	74th Wettest	Wettest since: 1998	2018
Dec 1998–Oct 1999 11-Month	-0.39	0.04	-0.43	34th Driest	Driest since: 1995	1963
Dec 1998–Oct 1999 11-Month	-0.39	0.04	-0.43	96th Wettest	Wettest since: 1998	1975
Nov 1998–Oct 1999 12-Month	-0.60	0.01	-0.61	26th Driest	Driest since: 1995	2002
	-0.60	0.01	-0.61	104th Wettest	Wettest since: 1998	2003
	Ties: 1995
May 1998–Oct 1999 18-Month	-0.58	0.01	-0.59	19th Driest	Driest since: 1992	1965
	-0.58	0.01	-0.59	111th Wettest	Wettest since: 1998	2019
	Ties: 1957
Nov 1997–Oct 1999 24-Month	-0.28	0.01	-0.29	36th Driest	Driest since: 1992	1966
Nov 1997–Oct 1999 24-Month	-0.28	0.01	-0.29	93rd Wettest	Wettest since: 1998	2019
Nov 1996–Oct 1999 36-Month	-0.26	0.01	-0.27	26th Driest	Driest since: 1993	1965
	-0.26	0.01	-0.27	102nd Wettest	Wettest since: 1998	1904
	Ties: 1943, 1959
Nov 1995–Oct 1999 48-Month	0.14	0.02	0.12	77th Driest	Driest since: 1998	1966
	0.14	0.02	0.12	50th Wettest	Wettest since: 1998	2021
	Ties: 1938, 1998
Nov 1994–Oct 1999 60-Month	-0.01	0.02	-0.03	57th Driest	Driest since: 1995	1966
Nov 1994–Oct 1999 60-Month	-0.01	0.02	-0.03	69th Wettest	Wettest since: 1998	1906

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on April 1, 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 3

October 1999 Palmer Z-Index Rankings

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