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 2015

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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 2015 1-Month	1.42" (36.07mm)	0.92" (23.37mm)	0.50" (12.70mm)	107th Driest	Driest since: 2014	1924
May 2015 1-Month	1.42" (36.07mm)	0.92" (23.37mm)	0.50" (12.70mm)	22nd Wettest	Wettest since: 2011	1998
Apr–May 2015 2-Month	2.33" (59.18mm)	2.26" (57.40mm)	0.07" (1.78mm)	76th Driest	Driest since: 2014	1909
	2.33" (59.18mm)	2.26" (57.40mm)	0.07" (1.78mm)	53rd Wettest	Wettest since: 2011	1896
	Ties: 1944, 2000
Mar–May 2015 3-Month	2.95" (74.93mm)	4.59" (116.59mm)	-1.64" (-41.66mm)	25th Driest	Driest since: 2013	2008
Mar–May 2015 3-Month	2.95" (74.93mm)	4.59" (116.59mm)	-1.64" (-41.66mm)	104th Wettest	Wettest since: 2014	1995
Feb–May 2015 4-Month	4.87" (123.70mm)	7.31" (185.67mm)	-2.44" (-61.97mm)	25th Driest	Driest since: 2013	1997
Feb–May 2015 4-Month	4.87" (123.70mm)	7.31" (185.67mm)	-2.44" (-61.97mm)	104th Wettest	Wettest since: 2014	1998
Jan–May 2015 5-Month	5.46" (138.68mm)	10.29" (261.37mm)	-4.83" (-122.69mm)	9th Driest	Driest since: 2013	2022
	5.46" (138.68mm)	10.29" (261.37mm)	-4.83" (-122.69mm)	120th Wettest	Wettest since: 2014	1998
	Ties: 1947
Dec 2014–May 2015 6-Month	9.71" (246.63mm)	12.84" (326.14mm)	-3.13" (-79.51mm)	32nd Driest	Driest since: 2014	1924
Dec 2014–May 2015 6-Month	9.71" (246.63mm)	12.84" (326.14mm)	-3.13" (-79.51mm)	96th Wettest	Wettest since: 2011	1995
Nov 2014–May 2015 7-Month	11.09" (281.69mm)	14.71" (373.63mm)	-3.62" (-91.94mm)	25th Driest	Driest since: 2014	1977
Nov 2014–May 2015 7-Month	11.09" (281.69mm)	14.71" (373.63mm)	-3.62" (-91.94mm)	103rd Wettest	Wettest since: 2011	1995
Oct 2014–May 2015 8-Month	11.76" (298.70mm)	15.74" (399.80mm)	-3.98" (-101.10mm)	26th Driest	Driest since: 2014	1977
	11.76" (298.70mm)	15.74" (399.80mm)	-3.98" (-101.10mm)	102nd Wettest	Wettest since: 2011	1983
	Ties: 1939
Sep 2014–May 2015 9-Month	12.67" (321.82mm)	16.23" (412.24mm)	-3.56" (-90.42mm)	33rd Driest	Driest since: 2014	2021
Sep 2014–May 2015 9-Month	12.67" (321.82mm)	16.23" (412.24mm)	-3.56" (-90.42mm)	95th Wettest	Wettest since: 2011	1983
Aug 2014–May 2015 10-Month	13.55" (344.17mm)	16.62" (422.15mm)	-3.07" (-77.98mm)	39th Driest	Driest since: 2014	2021
Aug 2014–May 2015 10-Month	13.55" (344.17mm)	16.62" (422.15mm)	-3.07" (-77.98mm)	89th Wettest	Wettest since: 2011	1983
Jul 2014–May 2015 11-Month	14.00" (355.60mm)	16.95" (430.53mm)	-2.95" (-74.93mm)	44th Driest	Driest since: 2014	2021
Jul 2014–May 2015 11-Month	14.00" (355.60mm)	16.95" (430.53mm)	-2.95" (-74.93mm)	84th Wettest	Wettest since: 2011	1983
Jun 2014–May 2015 12-Month	14.08" (357.63mm)	17.44" (442.98mm)	-3.36" (-85.35mm)	38th Driest	Driest since: 2014	2021
Jun 2014–May 2015 12-Month	14.08" (357.63mm)	17.44" (442.98mm)	-3.36" (-85.35mm)	90th Wettest	Wettest since: 2011	1983
Dec 2013–May 2015 18-Month	21.78" (553.21mm)	30.25" (768.35mm)	-8.47" (-215.14mm)	9th Driest	Driest since: 2014	1977
Dec 2013–May 2015 18-Month	21.78" (553.21mm)	30.25" (768.35mm)	-8.47" (-215.14mm)	118th Wettest	Wettest since: 2012	1983
Jun 2013–May 2015 24-Month	25.27" (641.86mm)	34.89" (886.21mm)	-9.62" (-244.35mm)	7th Driest	Driest since: 2014	2022
Jun 2013–May 2015 24-Month	25.27" (641.86mm)	34.89" (886.21mm)	-9.62" (-244.35mm)	120th Wettest	Wettest since: 2013	1983
Jun 2012–May 2015 36-Month	38.11" (967.99mm)	52.30" (1,328.42mm)	-14.19" (-360.43mm)	5th Driest	Driest since: 2014	2022
Jun 2012–May 2015 36-Month	38.11" (967.99mm)	52.30" (1,328.42mm)	-14.19" (-360.43mm)	121st Wettest	Wettest since: 2013	1984
Jun 2011–May 2015 48-Month	50.83" (1,291.08mm)	69.56" (1,766.82mm)	-18.73" (-475.74mm)	1st Driest	Driest since: 2015	2015
Jun 2011–May 2015 48-Month	50.83" (1,291.08mm)	69.56" (1,766.82mm)	-18.73" (-475.74mm)	124th Wettest	Wettest since: 2014	1998
Jun 2010–May 2015 60-Month	72.49" (1,841.25mm)	86.83" (2,205.48mm)	-14.34" (-364.23mm)	9th Driest	Driest since: 1992	1933
Jun 2010–May 2015 60-Month	72.49" (1,841.25mm)	86.83" (2,205.48mm)	-14.34" (-364.23mm)	115th Wettest	Wettest since: 2014	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