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 1998 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1998 1-Month	-2.79	-0.08	-2.71	3rd Driest	Driest since: 1930	1930
December 1998 1-Month	-2.79	-0.08	-2.71	128th Wettest	Wettest since: 1997	1901
Nov–Dec 1998 2-Month	-3.04	-0.15	-2.89	6th Driest	Driest since: 1964	1930
Nov–Dec 1998 2-Month	-3.04	-0.15	-2.89	125th Wettest	Wettest since: 1997	1972
Oct–Dec 1998 3-Month	-2.08	-0.09	-1.99	8th Driest	Driest since: 1964	1930
	-2.08	-0.09	-1.99	123rd Wettest	Wettest since: 1997	1996
	Ties: 1928
Sep–Dec 1998 4-Month	-2.13	-0.04	-2.09	6th Driest	Driest since: 1964	1964
	-2.13	-0.04	-2.09	125th Wettest	Wettest since: 1997	2011
	Ties: 1941
Aug–Dec 1998 5-Month	-2.27	-0.01	-2.26	4th Driest	Driest since: 1964	1964
Aug–Dec 1998 5-Month	-2.27	-0.01	-2.26	127th Wettest	Wettest since: 1997	2018
Jul–Dec 1998 6-Month	-1.79	0.01	-1.80	6th Driest	Driest since: 1964	1964
Jul–Dec 1998 6-Month	-1.79	0.01	-1.80	125th Wettest	Wettest since: 1997	2018
Jun–Dec 1998 7-Month	-1.15	0.03	-1.18	14th Driest	Driest since: 1991	1964
Jun–Dec 1998 7-Month	-1.15	0.03	-1.18	117th Wettest	Wettest since: 1997	2018
May–Dec 1998 8-Month	-1.00	0.01	-1.01	16th Driest	Driest since: 1991	1964
May–Dec 1998 8-Month	-1.00	0.01	-1.01	115th Wettest	Wettest since: 1997	2018
Apr–Dec 1998 9-Month	-0.67	0.03	-0.70	26th Driest	Driest since: 1991	1964
Apr–Dec 1998 9-Month	-0.67	0.03	-0.70	105th Wettest	Wettest since: 1997	2018
Mar–Dec 1998 10-Month	-0.54	0.02	-0.56	28th Driest	Driest since: 1995	1964
Mar–Dec 1998 10-Month	-0.54	0.02	-0.56	103rd Wettest	Wettest since: 1997	2011
Feb–Dec 1998 11-Month	-0.29	0.01	-0.30	38th Driest	Driest since: 1997	1964
Feb–Dec 1998 11-Month	-0.29	0.01	-0.30	93rd Wettest	Wettest since: 1996	2011
Jan–Dec 1998 12-Month	-0.06	0.03	-0.09	54th Driest	Driest since: 1997	1991
	-0.06	0.03	-0.09	77th Wettest	Wettest since: 1996	2011, 2018
	Ties: 1924
Jul 1997–Dec 1998 18-Month	-0.03	0.02	-0.05	46th Driest	Driest since: 1992	1965
Jul 1997–Dec 1998 18-Month	-0.03	0.02	-0.05	84th Wettest	Wettest since: 1997	2019
Jan 1997–Dec 1998 24-Month	-0.22	0.03	-0.25	37th Driest	Driest since: 1992	1964
Jan 1997–Dec 1998 24-Month	-0.22	0.03	-0.25	93rd Wettest	Wettest since: 1997	2019
Jan 1996–Dec 1998 36-Month	0.42	0.03	0.39	97th Driest	Driest since: 1997	1965
	0.42	0.03	0.39	32nd Wettest	Wettest since: 1996	2019
	Ties: 1905, 1916
Jan 1995–Dec 1998 48-Month	0.19	0.03	0.16	74th Driest	Driest since: 1994	1966
Jan 1995–Dec 1998 48-Month	0.19	0.03	0.16	54th Wettest	Wettest since: 1997	2006
Jan 1994–Dec 1998 60-Month	0.42	0.03	0.39	97th Driest	Driest since: 1995	1966
Jan 1994–Dec 1998 60-Month	0.42	0.03	0.39	30th Wettest	Wettest since: 1997	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 1998 Palmer Z-Index Rankings

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