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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

October 1987 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
October 1987 1-Month	1.04	0.09	0.95	89th Driest	Driest since: 1986	1963
October 1987 1-Month	1.04	0.09	0.95	42nd Wettest	Wettest since: 1979	2005
Sep–Oct 1987 2-Month	3.00	0.07	2.93	123rd Driest	Driest since: 1986	1964
Sep–Oct 1987 2-Month	3.00	0.07	2.93	8th Wettest	Wettest since: 1977	2011
Aug–Oct 1987 3-Month	2.30	0.04	2.26	121st Driest	Driest since: 1986	1964
Aug–Oct 1987 3-Month	2.30	0.04	2.26	10th Wettest	Wettest since: 1976	2011
Jul–Oct 1987 4-Month	1.96	0.01	1.95	119th Driest	Driest since: 1986	1964
Jul–Oct 1987 4-Month	1.96	0.01	1.95	12th Wettest	Wettest since: 1976	2011
Jun–Oct 1987 5-Month	1.26	0.03	1.23	109th Driest	Driest since: 1986	1964
Jun–Oct 1987 5-Month	1.26	0.03	1.23	22nd Wettest	Wettest since: 1976	2011
May–Oct 1987 6-Month	0.73	-0.02	0.75	101st Driest	Driest since: 1986	1964
May–Oct 1987 6-Month	0.73	-0.02	0.75	30th Wettest	Wettest since: 1985	2011
Apr–Oct 1987 7-Month	0.91	-0.02	0.93	106th Driest	Driest since: 1986	1964
Apr–Oct 1987 7-Month	0.91	-0.02	0.93	25th Wettest	Wettest since: 1976	2011
Mar–Oct 1987 8-Month	0.49	-0.01	0.50	94th Driest	Driest since: 1986	1964
Mar–Oct 1987 8-Month	0.49	-0.01	0.50	37th Wettest	Wettest since: 1984	2011
Feb–Oct 1987 9-Month	0.11	0.00	0.11	70th Driest	Driest since: 1985	1964
	0.11	0.00	0.11	61st Wettest	Wettest since: 1986	2011
	Ties: 1971
Jan–Oct 1987 10-Month	0.18	0.01	0.17	77th Driest	Driest since: 1985	1991
Jan–Oct 1987 10-Month	0.18	0.01	0.17	54th Wettest	Wettest since: 1986	2011
Dec 1986–Oct 1987 11-Month	0.17	0.01	0.16	76th Driest	Driest since: 1985	1964, 1980
Dec 1986–Oct 1987 11-Month	0.17	0.01	0.16	54th Wettest	Wettest since: 1986	2011
Nov 1986–Oct 1987 12-Month	0.35	-0.01	0.36	95th Driest	Driest since: 1985	1965
Nov 1986–Oct 1987 12-Month	0.35	-0.01	0.36	35th Wettest	Wettest since: 1986	2011
May 1986–Oct 1987 18-Month	0.33	-0.02	0.35	89th Driest	Driest since: 1985	1965
May 1986–Oct 1987 18-Month	0.33	-0.02	0.35	41st Wettest	Wettest since: 1986	2019
Nov 1985–Oct 1987 24-Month	0.45	-0.02	0.47	99th Driest	Driest since: 1986	1965
Nov 1985–Oct 1987 24-Month	0.45	-0.02	0.47	30th Wettest	Wettest since: 1984	2019
Nov 1984–Oct 1987 36-Month	0.17	-0.01	0.18	83rd Driest	Driest since: 1983	1965
Nov 1984–Oct 1987 36-Month	0.17	-0.01	0.18	45th Wettest	Wettest since: 1986	1975
Nov 1983–Oct 1987 48-Month	0.34	-0.01	0.35	96th Driest	Driest since: 1986	1966
Nov 1983–Oct 1987 48-Month	0.34	-0.01	0.35	31st Wettest	Wettest since: 1979	1976
Nov 1982–Oct 1987 60-Month	0.30	-0.01	0.31	97th Driest	Driest since: 1986	1966
	0.30	-0.01	0.31	29th Wettest	Wettest since: 1979	1976
	Ties: 1956

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 1

October 1987 Palmer Z-Index Rankings

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