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 5

November 1990 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
November 1990 1-Month	-0.98	-0.27	-0.71	52nd Driest	Driest since: 1982	1930
November 1990 1-Month	-0.98	-0.27	-0.71	79th Wettest	Wettest since: 1989	2018
Oct–Nov 1990 2-Month	2.10	-0.12	2.22	119th Driest	Driest since: 1989	1930
Oct–Nov 1990 2-Month	2.10	-0.12	2.22	12th Wettest	Wettest since: 1977	1995
Sep–Nov 1990 3-Month	1.54	-0.03	1.57	115th Driest	Driest since: 1989	1930
Sep–Nov 1990 3-Month	1.54	-0.03	1.57	16th Wettest	Wettest since: 1979	2011
Aug–Nov 1990 4-Month	2.08	0.01	2.07	120th Driest	Driest since: 1989	1930
	2.08	0.01	2.07	11th Wettest	Wettest since: 1979	2011
	Ties: 1979
Jul–Nov 1990 5-Month	1.74	0.01	1.73	122nd Driest	Driest since: 1989	1930
	1.74	0.01	1.73	9th Wettest	Wettest since: 1956	2018
	Ties: 1956
Jun–Nov 1990 6-Month	1.26	0.04	1.22	114th Driest	Driest since: 1989	1930
Jun–Nov 1990 6-Month	1.26	0.04	1.22	17th Wettest	Wettest since: 1976	2018
May–Nov 1990 7-Month	1.44	0.00	1.44	122nd Driest	Driest since: 1989	1930
May–Nov 1990 7-Month	1.44	0.00	1.44	9th Wettest	Wettest since: 1972	2018
Apr–Nov 1990 8-Month	1.13	0.03	1.10	121st Driest	Driest since: 1989	1930
Apr–Nov 1990 8-Month	1.13	0.03	1.10	10th Wettest	Wettest since: 1972	2018
Mar–Nov 1990 9-Month	0.67	0.03	0.64	100th Driest	Driest since: 1988	1930
Mar–Nov 1990 9-Month	0.67	0.03	0.64	31st Wettest	Wettest since: 1989	2011
Feb–Nov 1990 10-Month	0.54	0.03	0.51	98th Driest	Driest since: 1988	1930
Feb–Nov 1990 10-Month	0.54	0.03	0.51	33rd Wettest	Wettest since: 1989	2011
Jan–Nov 1990 11-Month	0.55	0.06	0.49	101st Driest	Driest since: 1989	1930
	0.55	0.06	0.49	30th Wettest	Wettest since: 1984	2011
	Ties: 1978
Dec 1989–Nov 1990 12-Month	0.29	0.06	0.23	82nd Driest	Driest since: 1989	1930
Dec 1989–Nov 1990 12-Month	0.29	0.06	0.23	48th Wettest	Wettest since: 1984	2011
Jun 1989–Nov 1990 18-Month	0.49	0.05	0.44	96th Driest	Driest since: 1989	1931
Jun 1989–Nov 1990 18-Month	0.49	0.05	0.44	34th Wettest	Wettest since: 1984	2019
Dec 1988–Nov 1990 24-Month	0.25	0.05	0.20	79th Driest	Driest since: 1989	1931
	0.25	0.05	0.20	50th Wettest	Wettest since: 1985	2019
	Ties: 1933, 1956
Dec 1987–Nov 1990 36-Month	-0.10	0.05	-0.15	44th Driest	Driest since: 1989	1932
Dec 1987–Nov 1990 36-Month	-0.10	0.05	-0.15	84th Wettest	Wettest since: 1986	2019
Dec 1986–Nov 1990 48-Month	-0.13	0.05	-0.18	34th Driest	Driest since: 1989	1966
Dec 1986–Nov 1990 48-Month	-0.13	0.05	-0.18	93rd Wettest	Wettest since: 1987	2006
Dec 1985–Nov 1990 60-Month	-0.08	0.05	-0.13	33rd Driest	Driest since: 1989	1966
	-0.08	0.05	-0.13	93rd Wettest	Wettest since: 1988	1976
	Ties: 1939, 1983

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Divisional Rankings, published March 2025, retrieved on March 30, 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 5

November 1990 Palmer Z-Index Rankings

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