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 2021

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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 2021 1-Month	0.34" (8.64mm)	0.92" (23.37mm)	-0.58" (-14.73mm)	12th Driest	Driest since: 2012	1924
	0.34" (8.64mm)	0.92" (23.37mm)	-0.58" (-14.73mm)	117th Wettest	Wettest since: 2020	1998
	Ties: 1966
Apr–May 2021 2-Month	0.68" (17.27mm)	2.26" (57.40mm)	-1.58" (-40.13mm)	3rd Driest	Driest since: 1985	1909
	0.68" (17.27mm)	2.26" (57.40mm)	-1.58" (-40.13mm)	126th Wettest	Wettest since: 2020	1896
	Ties: 1924
Mar–May 2021 3-Month	2.07" (52.58mm)	4.59" (116.59mm)	-2.52" (-64.01mm)	6th Driest	Driest since: 2008	2008
Mar–May 2021 3-Month	2.07" (52.58mm)	4.59" (116.59mm)	-2.52" (-64.01mm)	123rd Wettest	Wettest since: 2020	1995
Feb–May 2021 4-Month	3.23" (82.04mm)	7.31" (185.67mm)	-4.08" (-103.63mm)	5th Driest	Driest since: 2013	1997
Feb–May 2021 4-Month	3.23" (82.04mm)	7.31" (185.67mm)	-4.08" (-103.63mm)	124th Wettest	Wettest since: 2020	1998
Jan–May 2021 5-Month	5.77" (146.56mm)	10.29" (261.37mm)	-4.52" (-114.81mm)	15th Driest	Driest since: 2015	2022
Jan–May 2021 5-Month	5.77" (146.56mm)	10.29" (261.37mm)	-4.52" (-114.81mm)	114th Wettest	Wettest since: 2020	1998
Dec 2020–May 2021 6-Month	7.09" (180.09mm)	12.84" (326.14mm)	-5.75" (-146.05mm)	6th Driest	Driest since: 1985	1924
Dec 2020–May 2021 6-Month	7.09" (180.09mm)	12.84" (326.14mm)	-5.75" (-146.05mm)	122nd Wettest	Wettest since: 2020	1995
Nov 2020–May 2021 7-Month	8.09" (205.49mm)	14.71" (373.63mm)	-6.62" (-168.14mm)	4th Driest	Driest since: 1977	1977
Nov 2020–May 2021 7-Month	8.09" (205.49mm)	14.71" (373.63mm)	-6.62" (-168.14mm)	124th Wettest	Wettest since: 2020	1995
Oct 2020–May 2021 8-Month	8.14" (206.76mm)	15.74" (399.80mm)	-7.60" (-193.04mm)	3rd Driest	Driest since: 1977	1977
Oct 2020–May 2021 8-Month	8.14" (206.76mm)	15.74" (399.80mm)	-7.60" (-193.04mm)	125th Wettest	Wettest since: 2020	1983
Sep 2020–May 2021 9-Month	8.19" (208.03mm)	16.23" (412.24mm)	-8.04" (-204.21mm)	1st Driest	Driest since: 2021	2021
Sep 2020–May 2021 9-Month	8.19" (208.03mm)	16.23" (412.24mm)	-8.04" (-204.21mm)	127th Wettest	Wettest since: 2020	1983
Aug 2020–May 2021 10-Month	8.30" (210.82mm)	16.62" (422.15mm)	-8.32" (-211.33mm)	1st Driest	Driest since: 2021	2021
Aug 2020–May 2021 10-Month	8.30" (210.82mm)	16.62" (422.15mm)	-8.32" (-211.33mm)	127th Wettest	Wettest since: 2020	1983
Jul 2020–May 2021 11-Month	8.37" (212.60mm)	16.95" (430.53mm)	-8.58" (-217.93mm)	1st Driest	Driest since: 2021	2021
Jul 2020–May 2021 11-Month	8.37" (212.60mm)	16.95" (430.53mm)	-8.58" (-217.93mm)	127th Wettest	Wettest since: 2020	1983
Jun 2020–May 2021 12-Month	8.69" (220.73mm)	17.44" (442.98mm)	-8.75" (-222.25mm)	1st Driest	Driest since: 2021	2021
Jun 2020–May 2021 12-Month	8.69" (220.73mm)	17.44" (442.98mm)	-8.75" (-222.25mm)	127th Wettest	Wettest since: 2020	1983
Dec 2019–May 2021 18-Month	18.76" (476.50mm)	30.25" (768.35mm)	-11.49" (-291.85mm)	2nd Driest	Driest since: 1977	1977
Dec 2019–May 2021 18-Month	18.76" (476.50mm)	30.25" (768.35mm)	-11.49" (-291.85mm)	125th Wettest	Wettest since: 2020	1983
Jun 2019–May 2021 24-Month	21.42" (544.07mm)	34.89" (886.21mm)	-13.47" (-342.14mm)	2nd Driest	Driest since: 2021	2022
Jun 2019–May 2021 24-Month	21.42" (544.07mm)	34.89" (886.21mm)	-13.47" (-342.14mm)	125th Wettest	Wettest since: 2020	1983
Jun 2018–May 2021 36-Month	43.40" (1,102.36mm)	52.30" (1,328.42mm)	-8.90" (-226.06mm)	21st Driest	Driest since: 2015	2022
Jun 2018–May 2021 36-Month	43.40" (1,102.36mm)	52.30" (1,328.42mm)	-8.90" (-226.06mm)	105th Wettest	Wettest since: 2020	1984
Jun 2017–May 2021 48-Month	56.94" (1,446.28mm)	69.56" (1,766.82mm)	-12.62" (-320.54mm)	12th Driest	Driest since: 2015	2015
Jun 2017–May 2021 48-Month	56.94" (1,446.28mm)	69.56" (1,766.82mm)	-12.62" (-320.54mm)	113th Wettest	Wettest since: 2020	1998
Jun 2016–May 2021 60-Month	82.39" (2,092.71mm)	86.83" (2,205.48mm)	-4.44" (-112.77mm)	50th Driest	Driest since: 2016	1933
Jun 2016–May 2021 60-Month	82.39" (2,092.71mm)	86.83" (2,205.48mm)	-4.44" (-112.77mm)	74th Wettest	Wettest since: 2020	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published January 2023, retrieved on January 29, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings