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 1978

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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 1978 1-Month	3.01" (76.45mm)	1.33" (33.78mm)	1.68" (42.67mm)	121st Driest	Driest since: 1977	1909
April 1978 1-Month	3.01" (76.45mm)	1.33" (33.78mm)	1.68" (42.67mm)	8th Wettest	Wettest since: 1967	1935
Mar–Apr 1978 2-Month	7.43" (188.72mm)	3.67" (93.22mm)	3.76" (95.50mm)	126th Driest	Driest since: 1977	2008
Mar–Apr 1978 2-Month	7.43" (188.72mm)	3.67" (93.22mm)	3.76" (95.50mm)	3rd Wettest	Wettest to Date	1983
Feb–Apr 1978 3-Month	11.62" (295.15mm)	6.39" (162.31mm)	5.23" (132.84mm)	123rd Driest	Driest since: 1977	1997
Feb–Apr 1978 3-Month	11.62" (295.15mm)	6.39" (162.31mm)	5.23" (132.84mm)	6th Wettest	Wettest since: 1958	1983
Jan–Apr 1978 4-Month	17.00" (431.80mm)	9.37" (238.00mm)	7.63" (193.80mm)	125th Driest	Driest since: 1977	2022
Jan–Apr 1978 4-Month	17.00" (431.80mm)	9.37" (238.00mm)	7.63" (193.80mm)	4th Wettest	Wettest to Date	1995
Dec 1977–Apr 1978 5-Month	21.16" (537.46mm)	11.92" (302.77mm)	9.24" (234.69mm)	127th Driest	Driest since: 1977	1977
Dec 1977–Apr 1978 5-Month	21.16" (537.46mm)	11.92" (302.77mm)	9.24" (234.69mm)	1st Wettest	Wettest to Date	1978
Nov 1977–Apr 1978 6-Month	22.71" (576.83mm)	13.79" (350.27mm)	8.92" (226.56mm)	125th Driest	Driest since: 1977	1977
Nov 1977–Apr 1978 6-Month	22.71" (576.83mm)	13.79" (350.27mm)	8.92" (226.56mm)	3rd Wettest	Wettest to Date	1983
Oct 1977–Apr 1978 7-Month	23.05" (585.47mm)	14.82" (376.43mm)	8.23" (209.04mm)	124th Driest	Driest since: 1977	1977
Oct 1977–Apr 1978 7-Month	23.05" (585.47mm)	14.82" (376.43mm)	8.23" (209.04mm)	4th Wettest	Wettest to Date	1983
Sep 1977–Apr 1978 8-Month	23.72" (602.49mm)	15.31" (388.87mm)	8.41" (213.62mm)	122nd Driest	Driest since: 1977	1977
Sep 1977–Apr 1978 8-Month	23.72" (602.49mm)	15.31" (388.87mm)	8.41" (213.62mm)	6th Wettest	Wettest since: 1941	1983
Aug 1977–Apr 1978 9-Month	24.75" (628.65mm)	15.70" (398.78mm)	9.05" (229.87mm)	126th Driest	Driest since: 1977	1977
Aug 1977–Apr 1978 9-Month	24.75" (628.65mm)	15.70" (398.78mm)	9.05" (229.87mm)	2nd Wettest	Wettest to Date	1983
Jul 1977–Apr 1978 10-Month	24.98" (634.49mm)	16.03" (407.16mm)	8.95" (227.33mm)	126th Driest	Driest since: 1977	2021
Jul 1977–Apr 1978 10-Month	24.98" (634.49mm)	16.03" (407.16mm)	8.95" (227.33mm)	2nd Wettest	Wettest to Date	1983
Jun 1977–Apr 1978 11-Month	25.67" (652.02mm)	16.52" (419.61mm)	9.15" (232.41mm)	125th Driest	Driest since: 1977	2021
Jun 1977–Apr 1978 11-Month	25.67" (652.02mm)	16.52" (419.61mm)	9.15" (232.41mm)	3rd Wettest	Wettest to Date	1983
May 1977–Apr 1978 12-Month	27.72" (704.09mm)	17.44" (442.98mm)	10.28" (261.11mm)	126th Driest	Driest since: 1977	1977
May 1977–Apr 1978 12-Month	27.72" (704.09mm)	17.44" (442.98mm)	10.28" (261.11mm)	2nd Wettest	Wettest to Date	1983
Nov 1976–Apr 1978 18-Month	32.30" (820.42mm)	31.22" (792.99mm)	1.08" (27.43mm)	80th Driest	Driest since: 1977	1977
	32.30" (820.42mm)	31.22" (792.99mm)	1.08" (27.43mm)	47th Wettest	Wettest since: 1975	1983
	Ties: 1944
May 1976–Apr 1978 24-Month	36.67" (931.42mm)	34.90" (886.46mm)	1.77" (44.96mm)	83rd Driest	Driest since: 1977	1977
May 1976–Apr 1978 24-Month	36.67" (931.42mm)	34.90" (886.46mm)	1.77" (44.96mm)	44th Wettest	Wettest since: 1975	1983
May 1975–Apr 1978 36-Month	48.36" (1,228.34mm)	52.30" (1,328.42mm)	-3.94" (-100.08mm)	44th Driest	Driest since: 1977	2022
May 1975–Apr 1978 36-Month	48.36" (1,228.34mm)	52.30" (1,328.42mm)	-3.94" (-100.08mm)	82nd Wettest	Wettest since: 1976	1984
May 1974–Apr 1978 48-Month	65.09" (1,653.29mm)	69.56" (1,766.82mm)	-4.47" (-113.53mm)	46th Driest	Driest since: 1977	2015
May 1974–Apr 1978 48-Month	65.09" (1,653.29mm)	69.56" (1,766.82mm)	-4.47" (-113.53mm)	79th Wettest	Wettest since: 1976	1998
May 1973–Apr 1978 60-Month	85.25" (2,165.35mm)	86.83" (2,205.48mm)	-1.58" (-40.13mm)	65th Driest	Driest since: 1977	1933
May 1973–Apr 1978 60-Month	85.25" (2,165.35mm)	86.83" (2,205.48mm)	-1.58" (-40.13mm)	59th Wettest	Wettest since: 1975	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