National Rankings

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Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

Precipitation Rankings, December 1999

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
December 1999 1-Month	1.73" (43.94mm)	2.35" (59.69mm)	-0.62" (-15.75mm)	20th Driest	Driest since: 1989	1930
	1.73" (43.94mm)	2.35" (59.69mm)	-0.62" (-15.75mm)	109th Wettest	Wettest since: 1998	2015
	Ties: 1908
Nov–Dec 1999 2-Month	3.17" (80.52mm)	4.58" (116.33mm)	-1.41" (-35.81mm)	5th Driest	Driest since: 1989	1976
Nov–Dec 1999 2-Month	3.17" (80.52mm)	4.58" (116.33mm)	-1.41" (-35.81mm)	124th Wettest	Wettest since: 1998	2015
Oct–Dec 1999 3-Month	4.74" (120.40mm)	6.74" (171.20mm)	-2.00" (-50.80mm)	3rd Driest	Driest since: 1939	1917
Oct–Dec 1999 3-Month	4.74" (120.40mm)	6.74" (171.20mm)	-2.00" (-50.80mm)	126th Wettest	Wettest since: 1998	2015
Sep–Dec 1999 4-Month	7.26" (184.40mm)	9.23" (234.44mm)	-1.97" (-50.04mm)	8th Driest	Driest since: 1956	1939
	7.26" (184.40mm)	9.23" (234.44mm)	-1.97" (-50.04mm)	121st Wettest	Wettest since: 1998	2018
	Ties: 1908
Aug–Dec 1999 5-Month	9.56" (242.82mm)	11.85" (300.99mm)	-2.29" (-58.17mm)	8th Driest	Driest since: 1976	1917
Aug–Dec 1999 5-Month	9.56" (242.82mm)	11.85" (300.99mm)	-2.29" (-58.17mm)	121st Wettest	Wettest since: 1998	2018
Jul–Dec 1999 6-Month	12.14" (308.36mm)	14.62" (371.35mm)	-2.48" (-62.99mm)	8th Driest	Driest since: 1976	1917
Jul–Dec 1999 6-Month	12.14" (308.36mm)	14.62" (371.35mm)	-2.48" (-62.99mm)	121st Wettest	Wettest since: 1998	2018
Jun–Dec 1999 7-Month	15.45" (392.43mm)	17.55" (445.77mm)	-2.10" (-53.34mm)	15th Driest	Driest since: 1980	1917
Jun–Dec 1999 7-Month	15.45" (392.43mm)	17.55" (445.77mm)	-2.10" (-53.34mm)	114th Wettest	Wettest since: 1998	2018
May–Dec 1999 8-Month	18.36" (466.34mm)	20.46" (519.68mm)	-2.10" (-53.34mm)	18th Driest	Driest since: 1988	1917
May–Dec 1999 8-Month	18.36" (466.34mm)	20.46" (519.68mm)	-2.10" (-53.34mm)	111th Wettest	Wettest since: 1998	2015
Apr–Dec 1999 9-Month	21.23" (539.24mm)	22.98" (583.69mm)	-1.75" (-44.45mm)	26th Driest	Driest since: 1988	1956
Apr–Dec 1999 9-Month	21.23" (539.24mm)	22.98" (583.69mm)	-1.75" (-44.45mm)	103rd Wettest	Wettest since: 1998	2015
Mar–Dec 1999 10-Month	23.42" (594.87mm)	25.49" (647.45mm)	-2.07" (-52.58mm)	19th Driest	Driest since: 1988	1956
Mar–Dec 1999 10-Month	23.42" (594.87mm)	25.49" (647.45mm)	-2.07" (-52.58mm)	110th Wettest	Wettest since: 1998	2015
Feb–Dec 1999 11-Month	25.34" (643.64mm)	27.62" (701.55mm)	-2.28" (-57.91mm)	19th Driest	Driest since: 1988	1910
Feb–Dec 1999 11-Month	25.34" (643.64mm)	27.62" (701.55mm)	-2.28" (-57.91mm)	110th Wettest	Wettest since: 1998	2018
Jan–Dec 1999 12-Month	28.47" (723.14mm)	29.94" (760.48mm)	-1.47" (-37.34mm)	28th Driest	Driest since: 1988	1910
Jan–Dec 1999 12-Month	28.47" (723.14mm)	29.94" (760.48mm)	-1.47" (-37.34mm)	101st Wettest	Wettest since: 1998	1973
Jul 1998–Dec 1999 18-Month	43.94" (1,116.08mm)	44.58" (1,132.33mm)	-0.64" (-16.25mm)	42nd Driest	Driest since: 1989	1954
Jul 1998–Dec 1999 18-Month	43.94" (1,116.08mm)	44.58" (1,132.33mm)	-0.64" (-16.25mm)	86th Wettest	Wettest since: 1998	2019
Jan 1998–Dec 1999 24-Month	62.36" (1,583.94mm)	59.90" (1,521.46mm)	2.46" (62.48mm)	93rd Driest	Driest since: 1990	1931
Jan 1998–Dec 1999 24-Month	62.36" (1,583.94mm)	59.90" (1,521.46mm)	2.46" (62.48mm)	35th Wettest	Wettest since: 1998	2019
Jan 1997–Dec 1999 36-Month	94.22" (2,393.19mm)	89.86" (2,282.44mm)	4.36" (110.75mm)	101st Driest	Driest since: 1991	1956
Jan 1997–Dec 1999 36-Month	94.22" (2,393.19mm)	89.86" (2,282.44mm)	4.36" (110.75mm)	26th Wettest	Wettest since: 1998	2019
Jan 1996–Dec 1999 48-Month	127.92" (3,249.17mm)	119.78" (3,042.41mm)	8.14" (206.76mm)	113th Driest	Driest since: 1995	1956
	127.92" (3,249.17mm)	119.78" (3,042.41mm)	8.14" (206.76mm)	13th Wettest	Wettest since: 1998	2019
	Ties: 2016
Jan 1995–Dec 1999 60-Month	160.61" (4,079.49mm)	149.68" (3,801.87mm)	10.93" (277.62mm)	115th Driest	Driest since: 1995	1956
Jan 1995–Dec 1999 60-Month	160.61" (4,079.49mm)	149.68" (3,801.87mm)	10.93" (277.62mm)	10th Wettest	Wettest since: 1998	2019

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 23, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings