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.

Idaho, Climate Division 2

December 1999 Palmer Z-Index Rankings

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2025)	Driest/Wettest Since	Record
December 1999 1-Month	1.04	-0.15	1.19	103rd Driest	Driest since: 1997	1976
December 1999 1-Month	1.04	-0.15	1.19	28th Wettest	Wettest since: 1998	1964
Nov–Dec 1999 2-Month	0.39	0.02	0.37	78th Driest	Driest since: 1997	1936, 1976
Nov–Dec 1999 2-Month	0.39	0.02	0.37	53rd Wettest	Wettest since: 1998	1927
Oct–Dec 1999 3-Month	0.21	-0.01	0.22	73rd Driest	Driest since: 1997	1936
	0.21	-0.01	0.22	58th Wettest	Wettest since: 1998	1927
	Ties: 1923
Sep–Dec 1999 4-Month	-0.40	-0.01	-0.39	54th Driest	Driest since: 1993	1936
	-0.40	-0.01	-0.39	77th Wettest	Wettest since: 1998	1927
	Ties: 1925
Aug–Dec 1999 5-Month	-0.21	-0.01	-0.20	70th Driest	Driest since: 1994	1936
	-0.21	-0.01	-0.20	61st Wettest	Wettest since: 1998	1927
	Ties: 1923, 1954, 1957, 1978
Jul–Dec 1999 6-Month	-0.24	0.01	-0.25	65th Driest	Driest since: 1994	1936
Jul–Dec 1999 6-Month	-0.24	0.01	-0.25	66th Wettest	Wettest since: 1998	1927
Jun–Dec 1999 7-Month	-0.14	0.01	-0.15	73rd Driest	Driest since: 1994	1936
Jun–Dec 1999 7-Month	-0.14	0.01	-0.15	58th Wettest	Wettest since: 1998	1995
May–Dec 1999 8-Month	-0.21	0.02	-0.23	66th Driest	Driest since: 1994	1936
May–Dec 1999 8-Month	-0.21	0.02	-0.23	65th Wettest	Wettest since: 1998	1927
Apr–Dec 1999 9-Month	-0.32	0.02	-0.34	52nd Driest	Driest since: 1992	1936
	-0.32	0.02	-0.34	79th Wettest	Wettest since: 1998	1927
	Ties: 1973
Mar–Dec 1999 10-Month	-0.34	0.01	-0.35	49th Driest	Driest since: 1994	1936
Mar–Dec 1999 10-Month	-0.34	0.01	-0.35	82nd Wettest	Wettest since: 1998	1948
Feb–Dec 1999 11-Month	0.00	0.01	-0.01	69th Driest	Driest since: 1994	1936
Feb–Dec 1999 11-Month	0.00	0.01	-0.01	62nd Wettest	Wettest since: 1998	1927
Jan–Dec 1999 12-Month	0.00	0.02	-0.02	70th Driest	Driest since: 1994	1987
Jan–Dec 1999 12-Month	0.00	0.02	-0.02	61st Wettest	Wettest since: 1998	1927
Jul 1998–Dec 1999 18-Month	0.31	0.02	0.29	90th Driest	Driest since: 1994	1936
Jul 1998–Dec 1999 18-Month	0.31	0.02	0.29	40th Wettest	Wettest since: 1998	1927
Jan 1998–Dec 1999 24-Month	0.23	0.02	0.21	85th Driest	Driest since: 1994	1936
Jan 1998–Dec 1999 24-Month	0.23	0.02	0.21	45th Wettest	Wettest since: 1998	1996
Jan 1997–Dec 1999 36-Month	0.43	0.02	0.41	111th Driest	Driest since: 1995	1936
	0.43	0.02	0.41	18th Wettest	Wettest since: 1998	1997
	Ties: 1977
Jan 1996–Dec 1999 48-Month	0.55	0.02	0.53	121st Driest	Driest since: 1996	1937
	0.55	0.02	0.53	7th Wettest	Wettest since: 1998	1998
	Ties: 1959
Jan 1995–Dec 1999 60-Month	0.73	0.02	0.71	126th Driest	Driest since: 1998	1938
Jan 1995–Dec 1999 60-Month	0.73	0.02	0.71	1st Wettest	Wettest to Date	1999

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

Idaho, Climate Division 2

December 1999 Palmer Z-Index Rankings

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