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, April 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
April 2021 1-Month	0.34" (8.64mm)	1.33" (33.78mm)	-0.99" (-25.14mm)	6th Driest	Driest since: 2008	1909
April 2021 1-Month	0.34" (8.64mm)	1.33" (33.78mm)	-0.99" (-25.14mm)	123rd Wettest	Wettest since: 2020	1935
Mar–Apr 2021 2-Month	1.73" (43.94mm)	3.67" (93.22mm)	-1.94" (-49.28mm)	12th Driest	Driest since: 2015	2008
Mar–Apr 2021 2-Month	1.73" (43.94mm)	3.67" (93.22mm)	-1.94" (-49.28mm)	117th Wettest	Wettest since: 2020	1983
Feb–Apr 2021 3-Month	2.89" (73.41mm)	6.39" (162.31mm)	-3.50" (-88.90mm)	8th Driest	Driest since: 2013	1997
Feb–Apr 2021 3-Month	2.89" (73.41mm)	6.39" (162.31mm)	-3.50" (-88.90mm)	121st Wettest	Wettest since: 2020	1983
Jan–Apr 2021 4-Month	5.43" (137.92mm)	9.37" (238.00mm)	-3.94" (-100.08mm)	17th Driest	Driest since: 2015	2022
Jan–Apr 2021 4-Month	5.43" (137.92mm)	9.37" (238.00mm)	-3.94" (-100.08mm)	112th Wettest	Wettest since: 2020	1995
Dec 2020–Apr 2021 5-Month	6.75" (171.45mm)	11.92" (302.77mm)	-5.17" (-131.32mm)	9th Driest	Driest since: 1990	1977
Dec 2020–Apr 2021 5-Month	6.75" (171.45mm)	11.92" (302.77mm)	-5.17" (-131.32mm)	119th Wettest	Wettest since: 2020	1978
Nov 2020–Apr 2021 6-Month	7.75" (196.85mm)	13.79" (350.27mm)	-6.04" (-153.42mm)	5th Driest	Driest since: 1990	1977
Nov 2020–Apr 2021 6-Month	7.75" (196.85mm)	13.79" (350.27mm)	-6.04" (-153.42mm)	123rd Wettest	Wettest since: 2020	1983
Oct 2020–Apr 2021 7-Month	7.80" (198.12mm)	14.82" (376.43mm)	-7.02" (-178.31mm)	3rd Driest	Driest since: 1977	1977
Oct 2020–Apr 2021 7-Month	7.80" (198.12mm)	14.82" (376.43mm)	-7.02" (-178.31mm)	125th Wettest	Wettest since: 2020	1983
Sep 2020–Apr 2021 8-Month	7.85" (199.39mm)	15.31" (388.87mm)	-7.46" (-189.48mm)	2nd Driest	Driest since: 1977	1977
Sep 2020–Apr 2021 8-Month	7.85" (199.39mm)	15.31" (388.87mm)	-7.46" (-189.48mm)	126th Wettest	Wettest since: 2020	1983
Aug 2020–Apr 2021 9-Month	7.96" (202.18mm)	15.70" (398.78mm)	-7.74" (-196.60mm)	2nd Driest	Driest since: 1977	1977
Aug 2020–Apr 2021 9-Month	7.96" (202.18mm)	15.70" (398.78mm)	-7.74" (-196.60mm)	126th Wettest	Wettest since: 2020	1983
Jul 2020–Apr 2021 10-Month	8.03" (203.96mm)	16.03" (407.16mm)	-8.00" (-203.20mm)	1st Driest	Driest since: 2021	2021
Jul 2020–Apr 2021 10-Month	8.03" (203.96mm)	16.03" (407.16mm)	-8.00" (-203.20mm)	127th Wettest	Wettest since: 2020	1983
Jun 2020–Apr 2021 11-Month	8.35" (212.09mm)	16.52" (419.61mm)	-8.17" (-207.52mm)	1st Driest	Driest since: 2021	2021
Jun 2020–Apr 2021 11-Month	8.35" (212.09mm)	16.52" (419.61mm)	-8.17" (-207.52mm)	127th Wettest	Wettest since: 2020	1983
May 2020–Apr 2021 12-Month	9.32" (236.73mm)	17.44" (442.98mm)	-8.12" (-206.25mm)	2nd Driest	Driest since: 1977	1977
May 2020–Apr 2021 12-Month	9.32" (236.73mm)	17.44" (442.98mm)	-8.12" (-206.25mm)	126th Wettest	Wettest since: 2020	1983
Nov 2019–Apr 2021 18-Month	19.77" (502.16mm)	31.22" (792.99mm)	-11.45" (-290.83mm)	2nd Driest	Driest since: 1977	1977
Nov 2019–Apr 2021 18-Month	19.77" (502.16mm)	31.22" (792.99mm)	-11.45" (-290.83mm)	125th Wettest	Wettest since: 2020	1983
May 2019–Apr 2021 24-Month	23.62" (599.95mm)	34.90" (886.46mm)	-11.28" (-286.51mm)	3rd Driest	Driest since: 1977	1977
May 2019–Apr 2021 24-Month	23.62" (599.95mm)	34.90" (886.46mm)	-11.28" (-286.51mm)	124th Wettest	Wettest since: 2020	1983
May 2018–Apr 2021 36-Month	44.06" (1,119.12mm)	52.30" (1,328.42mm)	-8.24" (-209.30mm)	24th Driest	Driest since: 2015	2022
May 2018–Apr 2021 36-Month	44.06" (1,119.12mm)	52.30" (1,328.42mm)	-8.24" (-209.30mm)	102nd Wettest	Wettest since: 2020	1984
May 2017–Apr 2021 48-Month	57.07" (1,449.58mm)	69.56" (1,766.82mm)	-12.49" (-317.24mm)	14th Driest	Driest since: 2016	2015
May 2017–Apr 2021 48-Month	57.07" (1,449.58mm)	69.56" (1,766.82mm)	-12.49" (-317.24mm)	111th Wettest	Wettest since: 2020	1998
May 2016–Apr 2021 60-Month	82.91" (2,105.91mm)	86.83" (2,205.48mm)	-3.92" (-99.57mm)	51st Driest	Driest since: 2017	1933
May 2016–Apr 2021 60-Month	82.91" (2,105.91mm)	86.83" (2,205.48mm)	-3.92" (-99.57mm)	73rd 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 February 1, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings