National Rankings

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Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Contiguous U.S.

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	2.54" (64.52mm)	2.52" (64.01mm)	0.02" (0.51mm)	71st Driest	Driest since: 1977	1987
	2.54" (64.52mm)	2.52" (64.01mm)	0.02" (0.51mm)	58th Wettest	Wettest since: 1975	1957
	Ties: 1933, 1948, 2006, 2008
Mar–Apr 1978 2-Month	4.80" (121.92mm)	5.03" (127.76mm)	-0.23" (-5.84mm)	52nd Driest	Driest since: 1972	1910
	4.80" (121.92mm)	5.03" (127.76mm)	-0.23" (-5.84mm)	77th Wettest	Wettest since: 1977	1973
	Ties: 1996, 2007
Feb–Apr 1978 3-Month	6.57" (166.88mm)	7.16" (181.86mm)	-0.59" (-14.98mm)	29th Driest	Driest since: 1972	1910
	6.57" (166.88mm)	7.16" (181.86mm)	-0.59" (-14.98mm)	100th Wettest	Wettest since: 1977	1983
	Ties: 1981
Jan–Apr 1978 4-Month	9.75" (247.65mm)	9.48" (240.79mm)	0.27" (6.86mm)	83rd Driest	Driest since: 1977	1910
Jan–Apr 1978 4-Month	9.75" (247.65mm)	9.48" (240.79mm)	0.27" (6.86mm)	46th Wettest	Wettest since: 1975	1998
Dec 1977–Apr 1978 5-Month	12.47" (316.74mm)	11.82" (300.23mm)	0.65" (16.51mm)	94th Driest	Driest since: 1977	1931
Dec 1977–Apr 1978 5-Month	12.47" (316.74mm)	11.82" (300.23mm)	0.65" (16.51mm)	34th Wettest	Wettest since: 1975	1983
Nov 1977–Apr 1978 6-Month	15.33" (389.38mm)	14.05" (356.87mm)	1.28" (32.51mm)	103rd Driest	Driest since: 1977	1977
Nov 1977–Apr 1978 6-Month	15.33" (389.38mm)	14.05" (356.87mm)	1.28" (32.51mm)	25th Wettest	Wettest since: 1975	1983
Oct 1977–Apr 1978 7-Month	17.52" (445.01mm)	16.22" (411.99mm)	1.30" (33.02mm)	97th Driest	Driest since: 1977	1981
Oct 1977–Apr 1978 7-Month	17.52" (445.01mm)	16.22" (411.99mm)	1.30" (33.02mm)	31st Wettest	Wettest since: 1975	1983
Sep 1977–Apr 1978 8-Month	20.74" (526.80mm)	18.71" (475.23mm)	2.03" (51.57mm)	111th Driest	Driest since: 1977	1918
	20.74" (526.80mm)	18.71" (475.23mm)	2.03" (51.57mm)	17th Wettest	Wettest since: 1974	2019
	Ties: 2020
Aug 1977–Apr 1978 9-Month	24.29" (616.97mm)	21.33" (541.78mm)	2.96" (75.19mm)	119th Driest	Driest since: 1977	1918
Aug 1977–Apr 1978 9-Month	24.29" (616.97mm)	21.33" (541.78mm)	2.96" (75.19mm)	9th Wettest	Wettest since: 1973	2019
Jul 1977–Apr 1978 10-Month	26.85" (681.99mm)	24.12" (612.65mm)	2.73" (69.34mm)	116th Driest	Driest since: 1977	1931
Jul 1977–Apr 1978 10-Month	26.85" (681.99mm)	24.12" (612.65mm)	2.73" (69.34mm)	12th Wettest	Wettest since: 1974	2019
Jun 1977–Apr 1978 11-Month	29.34" (745.24mm)	27.04" (686.82mm)	2.30" (58.42mm)	111th Driest	Driest since: 1977	1931
Jun 1977–Apr 1978 11-Month	29.34" (745.24mm)	27.04" (686.82mm)	2.30" (58.42mm)	17th Wettest	Wettest since: 1974	2019
May 1977–Apr 1978 12-Month	32.01" (813.05mm)	29.95" (760.73mm)	2.06" (52.32mm)	104th Driest	Driest since: 1977	1918
May 1977–Apr 1978 12-Month	32.01" (813.05mm)	29.95" (760.73mm)	2.06" (52.32mm)	24th Wettest	Wettest since: 1974	2019
Nov 1976–Apr 1978 18-Month	42.66" (1,083.56mm)	44.02" (1,118.11mm)	-1.36" (-34.55mm)	38th Driest	Driest since: 1977	1931
Nov 1976–Apr 1978 18-Month	42.66" (1,083.56mm)	44.02" (1,118.11mm)	-1.36" (-34.55mm)	89th Wettest	Wettest since: 1976	2020
May 1976–Apr 1978 24-Month	57.99" (1,472.95mm)	59.92" (1,521.97mm)	-1.93" (-49.02mm)	33rd Driest	Driest since: 1977	1955
	57.99" (1,472.95mm)	59.92" (1,521.97mm)	-1.93" (-49.02mm)	94th Wettest	Wettest since: 1976	2020
	Ties: 1982
May 1975–Apr 1978 36-Month	88.24" (2,241.30mm)	89.88" (2,282.95mm)	-1.64" (-41.65mm)	43rd Driest	Driest since: 1977	1955
May 1975–Apr 1978 36-Month	88.24" (2,241.30mm)	89.88" (2,282.95mm)	-1.64" (-41.65mm)	83rd Wettest	Wettest since: 1976	2020
May 1974–Apr 1978 48-Month	120.14" (3,051.56mm)	119.77" (3,042.16mm)	0.37" (9.40mm)	60th Driest	Driest since: 1970	1956
May 1974–Apr 1978 48-Month	120.14" (3,051.56mm)	119.77" (3,042.16mm)	0.37" (9.40mm)	65th Wettest	Wettest since: 1977	2019
May 1973–Apr 1978 60-Month	153.34" (3,894.84mm)	149.63" (3,800.60mm)	3.71" (94.24mm)	86th Driest	Driest since: 1972	1957
	153.34" (3,894.84mm)	149.63" (3,800.60mm)	3.71" (94.24mm)	38th Wettest	Wettest since: 1977	2020
	Ties: 1962

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published March 2023, retrieved on March 20, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings