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 1977

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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 1977 1-Month	2.05" (52.07mm)	0.92" (23.37mm)	1.13" (28.70mm)	121st Driest	Driest since: 1976	1924
May 1977 1-Month	2.05" (52.07mm)	0.92" (23.37mm)	1.13" (28.70mm)	8th Wettest	Wettest since: 1957	1998
Apr–May 1977 2-Month	2.27" (57.66mm)	2.26" (57.40mm)	0.01" (0.26mm)	72nd Driest	Driest since: 1976	1909
	2.27" (57.66mm)	2.26" (57.40mm)	0.01" (0.26mm)	57th Wettest	Wettest since: 1971	1896
	Ties: 1999
Mar–May 1977 3-Month	3.48" (88.39mm)	4.59" (116.59mm)	-1.11" (-28.20mm)	37th Driest	Driest since: 1976	2008
	3.48" (88.39mm)	4.59" (116.59mm)	-1.11" (-28.20mm)	92nd Wettest	Wettest since: 1975	1995
	Ties: 1913
Feb–May 1977 4-Month	4.29" (108.97mm)	7.31" (185.67mm)	-3.02" (-76.70mm)	18th Driest	Driest since: 1972	1997
Feb–May 1977 4-Month	4.29" (108.97mm)	7.31" (185.67mm)	-3.02" (-76.70mm)	111th Wettest	Wettest since: 1976	1998
Jan–May 1977 5-Month	5.72" (145.29mm)	10.29" (261.37mm)	-4.57" (-116.08mm)	14th Driest	Driest since: 1972	2022
Jan–May 1977 5-Month	5.72" (145.29mm)	10.29" (261.37mm)	-4.57" (-116.08mm)	115th Wettest	Wettest since: 1976	1998
Dec 1976–May 1977 6-Month	6.06" (153.92mm)	12.84" (326.14mm)	-6.78" (-172.22mm)	2nd Driest	Driest since: 1924	1924
Dec 1976–May 1977 6-Month	6.06" (153.92mm)	12.84" (326.14mm)	-6.78" (-172.22mm)	126th Wettest	Wettest since: 1976	1995
Nov 1976–May 1977 7-Month	6.63" (168.40mm)	14.71" (373.63mm)	-8.08" (-205.23mm)	1st Driest	Driest since: 1977	1977
Nov 1976–May 1977 7-Month	6.63" (168.40mm)	14.71" (373.63mm)	-8.08" (-205.23mm)	127th Wettest	Wettest since: 1976	1995
Oct 1976–May 1977 8-Month	7.36" (186.94mm)	15.74" (399.80mm)	-8.38" (-212.86mm)	1st Driest	Driest since: 1977	1977
Oct 1976–May 1977 8-Month	7.36" (186.94mm)	15.74" (399.80mm)	-8.38" (-212.86mm)	127th Wettest	Wettest since: 1976	1983
Sep 1976–May 1977 9-Month	8.87" (225.30mm)	16.23" (412.24mm)	-7.36" (-186.94mm)	3rd Driest	Driest since: 1924	2021
Sep 1976–May 1977 9-Month	8.87" (225.30mm)	16.23" (412.24mm)	-7.36" (-186.94mm)	125th Wettest	Wettest since: 1976	1983
Aug 1976–May 1977 10-Month	9.51" (241.55mm)	16.62" (422.15mm)	-7.11" (-180.60mm)	3rd Driest	Driest since: 1924	2021
Aug 1976–May 1977 10-Month	9.51" (241.55mm)	16.62" (422.15mm)	-7.11" (-180.60mm)	125th Wettest	Wettest since: 1976	1983
Jul 1976–May 1977 11-Month	10.29" (261.37mm)	16.95" (430.53mm)	-6.66" (-169.16mm)	3rd Driest	Driest since: 1924	2021
Jul 1976–May 1977 11-Month	10.29" (261.37mm)	16.95" (430.53mm)	-6.66" (-169.16mm)	125th Wettest	Wettest since: 1976	1983
Jun 1976–May 1977 12-Month	10.58" (268.73mm)	17.44" (442.98mm)	-6.86" (-174.25mm)	3rd Driest	Driest since: 1924	2021
Jun 1976–May 1977 12-Month	10.58" (268.73mm)	17.44" (442.98mm)	-6.86" (-174.25mm)	125th Wettest	Wettest since: 1976	1983
Dec 1975–May 1977 18-Month	17.48" (443.99mm)	30.25" (768.35mm)	-12.77" (-324.36mm)	1st Driest	Driest since: 1977	1977
Dec 1975–May 1977 18-Month	17.48" (443.99mm)	30.25" (768.35mm)	-12.77" (-324.36mm)	126th Wettest	Wettest since: 1976	1983
Jun 1975–May 1977 24-Month	22.22" (564.39mm)	34.89" (886.21mm)	-12.67" (-321.82mm)	3rd Driest	Driest since: 1977	2022
Jun 1975–May 1977 24-Month	22.22" (564.39mm)	34.89" (886.21mm)	-12.67" (-321.82mm)	124th Wettest	Wettest since: 1976	1983
Jun 1974–May 1977 36-Month	39.26" (997.20mm)	52.30" (1,328.42mm)	-13.04" (-331.22mm)	7th Driest	Driest since: 1961	2022
Jun 1974–May 1977 36-Month	39.26" (997.20mm)	52.30" (1,328.42mm)	-13.04" (-331.22mm)	119th Wettest	Wettest since: 1976	1984
Jun 1973–May 1977 48-Month	59.04" (1,499.62mm)	69.56" (1,766.82mm)	-10.52" (-267.20mm)	18th Driest	Driest since: 1962	2015
Jun 1973–May 1977 48-Month	59.04" (1,499.62mm)	69.56" (1,766.82mm)	-10.52" (-267.20mm)	107th Wettest	Wettest since: 1976	1998
Jun 1972–May 1977 60-Month	79.62" (2,022.35mm)	86.83" (2,205.48mm)	-7.21" (-183.13mm)	38th Driest	Driest since: 1964	1933
Jun 1972–May 1977 60-Month	79.62" (2,022.35mm)	86.83" (2,205.48mm)	-7.21" (-183.13mm)	86th Wettest	Wettest since: 1976	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