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 1909

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Record Wettest
Period	Value	1901-2000 Mean	Anomaly	Rank (1895-2022)	Wettest/Driest Since	Record
May 1909 1-Month	0.27" (6.86mm)	0.92" (23.37mm)	-0.65" (-16.51mm)	8th Driest	Driest since: 1909	1924
May 1909 1-Month	0.27" (6.86mm)	0.92" (23.37mm)	-0.65" (-16.51mm)	121st Wettest	Wettest since: 1908	1998
Apr–May 1909 2-Month	0.43" (10.92mm)	2.26" (57.40mm)	-1.83" (-46.48mm)	1st Driest	Driest since: 1909	1909
Apr–May 1909 2-Month	0.43" (10.92mm)	2.26" (57.40mm)	-1.83" (-46.48mm)	128th Wettest	Wettest since: 1908	1896
Mar–May 1909 3-Month	2.54" (64.52mm)	4.59" (116.59mm)	-2.05" (-52.07mm)	14th Driest	Driest since: 1909	2008
Mar–May 1909 3-Month	2.54" (64.52mm)	4.59" (116.59mm)	-2.05" (-52.07mm)	115th Wettest	Wettest since: 1908	1995
Feb–May 1909 4-Month	6.90" (175.26mm)	7.31" (185.67mm)	-0.41" (-10.41mm)	67th Driest	Driest since: 1908	1997
Feb–May 1909 4-Month	6.90" (175.26mm)	7.31" (185.67mm)	-0.41" (-10.41mm)	62nd Wettest	Wettest since: 1907	1998
Jan–May 1909 5-Month	15.26" (387.60mm)	10.29" (261.37mm)	4.97" (126.23mm)	116th Driest	Driest since: 1908	2022
Jan–May 1909 5-Month	15.26" (387.60mm)	10.29" (261.37mm)	4.97" (126.23mm)	13th Wettest	Wettest since: 1907	1998
Dec 1908–May 1909 6-Month	16.57" (420.88mm)	12.84" (326.14mm)	3.73" (94.74mm)	105th Driest	Driest since: 1908	1924
Dec 1908–May 1909 6-Month	16.57" (420.88mm)	12.84" (326.14mm)	3.73" (94.74mm)	23rd Wettest	Wettest since: 1907	1995
Nov 1908–May 1909 7-Month	17.69" (449.33mm)	14.71" (373.63mm)	2.98" (75.70mm)	99th Driest	Driest since: 1908	1977
Nov 1908–May 1909 7-Month	17.69" (449.33mm)	14.71" (373.63mm)	2.98" (75.70mm)	29th Wettest	Wettest since: 1907	1995
Oct 1908–May 1909 8-Month	18.84" (478.54mm)	15.74" (399.80mm)	3.10" (78.74mm)	101st Driest	Driest since: 1908	1977
Oct 1908–May 1909 8-Month	18.84" (478.54mm)	15.74" (399.80mm)	3.10" (78.74mm)	27th Wettest	Wettest since: 1907	1983
Sep 1908–May 1909 9-Month	19.67" (499.62mm)	16.23" (412.24mm)	3.44" (87.38mm)	105th Driest	Driest since: 1908	2021
Sep 1908–May 1909 9-Month	19.67" (499.62mm)	16.23" (412.24mm)	3.44" (87.38mm)	23rd Wettest	Wettest since: 1907	1983
Aug 1908–May 1909 10-Month	20.10" (510.54mm)	16.62" (422.15mm)	3.48" (88.39mm)	104th Driest	Driest since: 1908	2021
Aug 1908–May 1909 10-Month	20.10" (510.54mm)	16.62" (422.15mm)	3.48" (88.39mm)	24th Wettest	Wettest since: 1907	1983
Jul 1908–May 1909 11-Month	20.43" (518.92mm)	16.95" (430.53mm)	3.48" (88.39mm)	104th Driest	Driest since: 1908	2021
Jul 1908–May 1909 11-Month	20.43" (518.92mm)	16.95" (430.53mm)	3.48" (88.39mm)	24th Wettest	Wettest since: 1907	1983
Jun 1908–May 1909 12-Month	20.77" (527.56mm)	17.44" (442.98mm)	3.33" (84.58mm)	104th Driest	Driest since: 1908	2021
	20.77" (527.56mm)	17.44" (442.98mm)	3.33" (84.58mm)	24th Wettest	Wettest since: 1907	1983
	Ties: 1915
Dec 1907–May 1909 18-Month	32.71" (830.83mm)	30.25" (768.35mm)	2.46" (62.48mm)	91st Driest	Driest since: 1904	1977
Dec 1907–May 1909 18-Month	32.71" (830.83mm)	30.25" (768.35mm)	2.46" (62.48mm)	36th Wettest	Wettest since: 1908	1983
Jun 1907–May 1909 24-Month	36.43" (925.32mm)	34.89" (886.21mm)	1.54" (39.11mm)	85th Driest	Driest since: 1903	2022
Jun 1907–May 1909 24-Month	36.43" (925.32mm)	34.89" (886.21mm)	1.54" (39.11mm)	42nd Wettest	Wettest since: 1908	1983
Jun 1906–May 1909 36-Month	60.75" (1,543.05mm)	52.30" (1,328.42mm)	8.45" (214.63mm)	109th Driest	Driest since: 1906	2022
Jun 1906–May 1909 36-Month	60.75" (1,543.05mm)	52.30" (1,328.42mm)	8.45" (214.63mm)	17th Wettest	Wettest since: 1908	1984
Jun 1905–May 1909 48-Month	81.56" (2,071.62mm)	69.56" (1,766.82mm)	12.00" (304.80mm)	113th Driest	Driest since: 1908	2015
Jun 1905–May 1909 48-Month	81.56" (2,071.62mm)	69.56" (1,766.82mm)	12.00" (304.80mm)	12th Wettest	Wettest since: 1907	1998
Jun 1904–May 1909 60-Month	100.84" (2,561.34mm)	86.83" (2,205.48mm)	14.01" (355.86mm)	110th Driest	Driest since: 1908	1933
Jun 1904–May 1909 60-Month	100.84" (2,561.34mm)	86.83" (2,205.48mm)	14.01" (355.86mm)	14th Wettest	Wettest since: 1907	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