Regional Rankings

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Please note, Palmer Indices are not available for NWS Regions. Degree Days are not available for Great Plains, Souther Plains and Gulf Coast Rockies and Westward, River Basins, or Agricultural Belts. 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 2009

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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 2009 1-Month	0.98" (24.89mm)	0.92" (23.37mm)	0.06" (1.52mm)	81st Driest	Driest since: 2008	1924
May 2009 1-Month	0.98" (24.89mm)	0.92" (23.37mm)	0.06" (1.52mm)	48th Wettest	Wettest since: 2005	1998
Apr–May 2009 2-Month	1.75" (44.45mm)	2.26" (57.40mm)	-0.51" (-12.95mm)	48th Driest	Driest since: 2008	1909
	1.75" (44.45mm)	2.26" (57.40mm)	-0.51" (-12.95mm)	81st Wettest	Wettest since: 2006	1896
	Ties: 1986
Mar–May 2009 3-Month	3.35" (85.09mm)	4.59" (116.59mm)	-1.24" (-31.50mm)	32nd Driest	Driest since: 2008	2008
Mar–May 2009 3-Month	3.35" (85.09mm)	4.59" (116.59mm)	-1.24" (-31.50mm)	97th Wettest	Wettest since: 2006	1995
Feb–May 2009 4-Month	6.55" (166.37mm)	7.31" (185.67mm)	-0.76" (-19.30mm)	58th Driest	Driest since: 2008	1997
Feb–May 2009 4-Month	6.55" (166.37mm)	7.31" (185.67mm)	-0.76" (-19.30mm)	71st Wettest	Wettest since: 2006	1998
Jan–May 2009 5-Month	7.65" (194.31mm)	10.29" (261.37mm)	-2.64" (-67.06mm)	34th Driest	Driest since: 2007	2022
Jan–May 2009 5-Month	7.65" (194.31mm)	10.29" (261.37mm)	-2.64" (-67.06mm)	95th Wettest	Wettest since: 2008	1998
Dec 2008–May 2009 6-Month	9.91" (251.71mm)	12.84" (326.14mm)	-2.93" (-74.43mm)	34th Driest	Driest since: 2007	1924
Dec 2008–May 2009 6-Month	9.91" (251.71mm)	12.84" (326.14mm)	-2.93" (-74.43mm)	94th Wettest	Wettest since: 2008	1995
Nov 2008–May 2009 7-Month	11.79" (299.47mm)	14.71" (373.63mm)	-2.92" (-74.16mm)	39th Driest	Driest since: 2008	1977
Nov 2008–May 2009 7-Month	11.79" (299.47mm)	14.71" (373.63mm)	-2.92" (-74.16mm)	89th Wettest	Wettest since: 2006	1995
Oct 2008–May 2009 8-Month	12.35" (313.69mm)	15.74" (399.80mm)	-3.39" (-86.11mm)	36th Driest	Driest since: 2007	1977
Oct 2008–May 2009 8-Month	12.35" (313.69mm)	15.74" (399.80mm)	-3.39" (-86.11mm)	92nd Wettest	Wettest since: 2008	1983
Sep 2008–May 2009 9-Month	12.43" (315.72mm)	16.23" (412.24mm)	-3.80" (-96.52mm)	27th Driest	Driest since: 2007	2021
Sep 2008–May 2009 9-Month	12.43" (315.72mm)	16.23" (412.24mm)	-3.80" (-96.52mm)	101st Wettest	Wettest since: 2008	1983
Aug 2008–May 2009 10-Month	12.57" (319.28mm)	16.62" (422.15mm)	-4.05" (-102.87mm)	27th Driest	Driest since: 2007	2021
Aug 2008–May 2009 10-Month	12.57" (319.28mm)	16.62" (422.15mm)	-4.05" (-102.87mm)	101st Wettest	Wettest since: 2008	1983
Jul 2008–May 2009 11-Month	12.79" (324.87mm)	16.95" (430.53mm)	-4.16" (-105.66mm)	24th Driest	Driest since: 2007	2021
Jul 2008–May 2009 11-Month	12.79" (324.87mm)	16.95" (430.53mm)	-4.16" (-105.66mm)	104th Wettest	Wettest since: 2008	1983
Jun 2008–May 2009 12-Month	12.91" (327.91mm)	17.44" (442.98mm)	-4.53" (-115.07mm)	20th Driest	Driest since: 2007	2021
	12.91" (327.91mm)	17.44" (442.98mm)	-4.53" (-115.07mm)	108th Wettest	Wettest since: 2008	1983
	Ties: 1950
Dec 2007–May 2009 18-Month	23.76" (603.50mm)	30.25" (768.35mm)	-6.49" (-164.85mm)	20th Driest	Driest since: 2008	1977
Dec 2007–May 2009 18-Month	23.76" (603.50mm)	30.25" (768.35mm)	-6.49" (-164.85mm)	107th Wettest	Wettest since: 2007	1983
Jun 2007–May 2009 24-Month	26.96" (684.78mm)	34.89" (886.21mm)	-7.93" (-201.43mm)	17th Driest	Driest since: 2008	2022
Jun 2007–May 2009 24-Month	26.96" (684.78mm)	34.89" (886.21mm)	-7.93" (-201.43mm)	110th Wettest	Wettest since: 2007	1983
Jun 2006–May 2009 36-Month	37.56" (954.02mm)	52.30" (1,328.42mm)	-14.74" (-374.40mm)	4th Driest	Driest since: 1931	2022
Jun 2006–May 2009 36-Month	37.56" (954.02mm)	52.30" (1,328.42mm)	-14.74" (-374.40mm)	122nd Wettest	Wettest since: 2008	1984
Jun 2005–May 2009 48-Month	59.97" (1,523.24mm)	69.56" (1,766.82mm)	-9.59" (-243.58mm)	21st Driest	Driest since: 2004	2015
Jun 2005–May 2009 48-Month	59.97" (1,523.24mm)	69.56" (1,766.82mm)	-9.59" (-243.58mm)	104th Wettest	Wettest since: 2008	1998
Jun 2004–May 2009 60-Month	83.41" (2,118.61mm)	86.83" (2,205.48mm)	-3.42" (-86.87mm)	59th Driest	Driest since: 2005	1933
Jun 2004–May 2009 60-Month	83.41" (2,118.61mm)	86.83" (2,205.48mm)	-3.42" (-86.87mm)	65th Wettest	Wettest since: 2008	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published March 2023, retrieved on March 26, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings