Regional Rankings

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Please note, Palmer Indices are not available for NWS Regions. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

West Climate Region

Precipitation Rankings, May 1999

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Record Driest

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
May 1999 1-Month	0.50" (12.70mm)	0.92" (23.37mm)	-0.42" (-10.67mm)	30th Driest	Driest since: 1997	1924
	0.50" (12.70mm)	0.92" (23.37mm)	-0.42" (-10.67mm)	99th Wettest	Wettest since: 1998	1998
	Ties: 1903, 1919, 1928, 1940
Apr–May 1999 2-Month	2.27" (57.66mm)	2.26" (57.40mm)	0.01" (0.26mm)	72nd Driest	Driest since: 1997	1909
	2.27" (57.66mm)	2.26" (57.40mm)	0.01" (0.26mm)	57th Wettest	Wettest since: 1998	1896
	Ties: 1977
Mar–May 1999 3-Month	3.84" (97.54mm)	4.59" (116.59mm)	-0.75" (-19.05mm)	54th Driest	Driest since: 1997	2008
Mar–May 1999 3-Month	3.84" (97.54mm)	4.59" (116.59mm)	-0.75" (-19.05mm)	75th Wettest	Wettest since: 1998	1995
Feb–May 1999 4-Month	7.08" (179.83mm)	7.31" (185.67mm)	-0.23" (-5.84mm)	69th Driest	Driest since: 1997	1997
Feb–May 1999 4-Month	7.08" (179.83mm)	7.31" (185.67mm)	-0.23" (-5.84mm)	60th Wettest	Wettest since: 1998	1998
Jan–May 1999 5-Month	9.69" (246.13mm)	10.29" (261.37mm)	-0.60" (-15.24mm)	67th Driest	Driest since: 1997	2022
Jan–May 1999 5-Month	9.69" (246.13mm)	10.29" (261.37mm)	-0.60" (-15.24mm)	62nd Wettest	Wettest since: 1998	1998
Dec 1998–May 1999 6-Month	10.83" (275.08mm)	12.84" (326.14mm)	-2.01" (-51.06mm)	49th Driest	Driest since: 1994	1924
Dec 1998–May 1999 6-Month	10.83" (275.08mm)	12.84" (326.14mm)	-2.01" (-51.06mm)	79th Wettest	Wettest since: 1998	1995
Nov 1998–May 1999 7-Month	13.74" (349.00mm)	14.71" (373.63mm)	-0.97" (-24.63mm)	62nd Driest	Driest since: 1994	1977
Nov 1998–May 1999 7-Month	13.74" (349.00mm)	14.71" (373.63mm)	-0.97" (-24.63mm)	66th Wettest	Wettest since: 1998	1995
Oct 1998–May 1999 8-Month	14.65" (372.11mm)	15.74" (399.80mm)	-1.09" (-27.69mm)	62nd Driest	Driest since: 1994	1977
Oct 1998–May 1999 8-Month	14.65" (372.11mm)	15.74" (399.80mm)	-1.09" (-27.69mm)	66th Wettest	Wettest since: 1998	1983
Sep 1998–May 1999 9-Month	15.86" (402.84mm)	16.23" (412.24mm)	-0.37" (-9.40mm)	67th Driest	Driest since: 1994	2021
Sep 1998–May 1999 9-Month	15.86" (402.84mm)	16.23" (412.24mm)	-0.37" (-9.40mm)	61st Wettest	Wettest since: 1998	1983
Aug 1998–May 1999 10-Month	16.05" (407.67mm)	16.62" (422.15mm)	-0.57" (-14.48mm)	63rd Driest	Driest since: 1994	2021
Aug 1998–May 1999 10-Month	16.05" (407.67mm)	16.62" (422.15mm)	-0.57" (-14.48mm)	65th Wettest	Wettest since: 1998	1983
Jul 1998–May 1999 11-Month	16.53" (419.86mm)	16.95" (430.53mm)	-0.42" (-10.67mm)	67th Driest	Driest since: 1994	2021
Jul 1998–May 1999 11-Month	16.53" (419.86mm)	16.95" (430.53mm)	-0.42" (-10.67mm)	61st Wettest	Wettest since: 1998	1983
Jun 1998–May 1999 12-Month	17.71" (449.83mm)	17.44" (442.98mm)	0.27" (6.85mm)	76th Driest	Driest since: 1994	2021
Jun 1998–May 1999 12-Month	17.71" (449.83mm)	17.44" (442.98mm)	0.27" (6.85mm)	52nd Wettest	Wettest since: 1998	1983
Dec 1997–May 1999 18-Month	40.02" (1,016.51mm)	30.25" (768.35mm)	9.77" (248.16mm)	118th Driest	Driest since: 1997	1977
Dec 1997–May 1999 18-Month	40.02" (1,016.51mm)	30.25" (768.35mm)	9.77" (248.16mm)	9th Wettest	Wettest since: 1998	1983
Jun 1997–May 1999 24-Month	46.48" (1,180.59mm)	34.89" (886.21mm)	11.59" (294.38mm)	122nd Driest	Driest since: 1997	2022
Jun 1997–May 1999 24-Month	46.48" (1,180.59mm)	34.89" (886.21mm)	11.59" (294.38mm)	5th Wettest	Wettest since: 1998	1983
Jun 1996–May 1999 36-Month	65.36" (1,660.14mm)	52.30" (1,328.42mm)	13.06" (331.72mm)	119th Driest	Driest since: 1997	2022
Jun 1996–May 1999 36-Month	65.36" (1,660.14mm)	52.30" (1,328.42mm)	13.06" (331.72mm)	7th Wettest	Wettest since: 1998	1984
Jun 1995–May 1999 48-Month	84.59" (2,148.59mm)	69.56" (1,766.82mm)	15.03" (381.77mm)	118th Driest	Driest since: 1997	2015
Jun 1995–May 1999 48-Month	84.59" (2,148.59mm)	69.56" (1,766.82mm)	15.03" (381.77mm)	7th Wettest	Wettest since: 1998	1998
Jun 1994–May 1999 60-Month	111.23" (2,825.24mm)	86.83" (2,205.48mm)	24.40" (619.76mm)	123rd Driest	Driest since: 1998	1933
Jun 1994–May 1999 60-Month	111.23" (2,825.24mm)	86.83" (2,205.48mm)	24.40" (619.76mm)	1st Wettest	Wettest to Date	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published January 2023, retrieved on January 27, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings