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, May 2010

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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 2010 1-Month	3.32" (84.33mm)	2.91" (73.91mm)	0.41" (10.42mm)	104th Driest	Driest since: 2009	1934
	3.32" (84.33mm)	2.91" (73.91mm)	0.41" (10.42mm)	25th Wettest	Wettest since: 2004	2019
	Ties: 1996
Apr–May 2010 2-Month	5.70" (144.78mm)	5.43" (137.92mm)	0.27" (6.86mm)	82nd Driest	Driest since: 2008	1934
Apr–May 2010 2-Month	5.70" (144.78mm)	5.43" (137.92mm)	0.27" (6.86mm)	47th Wettest	Wettest since: 2009	1957
Mar–May 2010 3-Month	8.00" (203.20mm)	7.94" (201.68mm)	0.06" (1.52mm)	69th Driest	Driest since: 2007	1925
Mar–May 2010 3-Month	8.00" (203.20mm)	7.94" (201.68mm)	0.06" (1.52mm)	60th Wettest	Wettest since: 2009	1957, 1991
Feb–May 2010 4-Month	10.01" (254.25mm)	10.07" (255.78mm)	-0.06" (-1.53mm)	69th Driest	Driest since: 2007	1925
	10.01" (254.25mm)	10.07" (255.78mm)	-0.06" (-1.53mm)	60th Wettest	Wettest since: 2009	2019
	Ties: 1896, 1996
Jan–May 2010 5-Month	12.63" (320.80mm)	12.39" (314.71mm)	0.24" (6.09mm)	76th Driest	Driest since: 2009	1934
Jan–May 2010 5-Month	12.63" (320.80mm)	12.39" (314.71mm)	0.24" (6.09mm)	53rd Wettest	Wettest since: 2008	2019
Dec 2009–May 2010 6-Month	15.71" (399.03mm)	14.73" (374.14mm)	0.98" (24.89mm)	96th Driest	Driest since: 2009	1931
	15.71" (399.03mm)	14.73" (374.14mm)	0.98" (24.89mm)	32nd Wettest	Wettest since: 2008	2019
	Ties: 2008
Nov 2009–May 2010 7-Month	17.34" (440.44mm)	16.96" (430.78mm)	0.38" (9.66mm)	77th Driest	Driest since: 2009	1934
Nov 2009–May 2010 7-Month	17.34" (440.44mm)	16.96" (430.78mm)	0.38" (9.66mm)	51st Wettest	Wettest since: 2005	1983
Oct 2009–May 2010 8-Month	21.63" (549.40mm)	19.13" (485.90mm)	2.50" (63.50mm)	115th Driest	Driest since: 2009	1934
Oct 2009–May 2010 8-Month	21.63" (549.40mm)	19.13" (485.90mm)	2.50" (63.50mm)	13th Wettest	Wettest since: 1998	2019
Sep 2009–May 2010 9-Month	24.17" (613.92mm)	21.62" (549.15mm)	2.55" (64.77mm)	115th Driest	Driest since: 2009	1934
Sep 2009–May 2010 9-Month	24.17" (613.92mm)	21.62" (549.15mm)	2.55" (64.77mm)	13th Wettest	Wettest since: 1998	2019
Aug 2009–May 2010 10-Month	26.86" (682.24mm)	24.25" (615.95mm)	2.61" (66.29mm)	113th Driest	Driest since: 2009	1918
Aug 2009–May 2010 10-Month	26.86" (682.24mm)	24.25" (615.95mm)	2.61" (66.29mm)	15th Wettest	Wettest since: 1998	2019
Jul 2009–May 2010 11-Month	29.93" (760.22mm)	27.03" (686.56mm)	2.90" (73.66mm)	115th Driest	Driest since: 2009	1931
Jul 2009–May 2010 11-Month	29.93" (760.22mm)	27.03" (686.56mm)	2.90" (73.66mm)	13th Wettest	Wettest since: 1998	2019
Jun 2009–May 2010 12-Month	32.94" (836.68mm)	29.95" (760.73mm)	2.99" (75.95mm)	113th Driest	Driest since: 2009	1934
Jun 2009–May 2010 12-Month	32.94" (836.68mm)	29.95" (760.73mm)	2.99" (75.95mm)	15th Wettest	Wettest since: 2005	2019
Dec 2008–May 2010 18-Month	47.77" (1,213.36mm)	44.70" (1,135.38mm)	3.07" (77.98mm)	105th Driest	Driest since: 2009	1931
	47.77" (1,213.36mm)	44.70" (1,135.38mm)	3.07" (77.98mm)	22nd Wettest	Wettest since: 2005	2019
	Ties: 1946
Jun 2008–May 2010 24-Month	63.43" (1,611.12mm)	59.92" (1,521.97mm)	3.51" (89.15mm)	103rd Driest	Driest since: 2009	1931
Jun 2008–May 2010 24-Month	63.43" (1,611.12mm)	59.92" (1,521.97mm)	3.51" (89.15mm)	24th Wettest	Wettest since: 2005	2020
Jun 2007–May 2010 36-Month	93.82" (2,383.03mm)	89.88" (2,282.95mm)	3.94" (100.08mm)	98th Driest	Driest since: 2009	1955
Jun 2007–May 2010 36-Month	93.82" (2,383.03mm)	89.88" (2,282.95mm)	3.94" (100.08mm)	28th Wettest	Wettest since: 2005	2019
Jun 2006–May 2010 48-Month	123.90" (3,147.06mm)	119.78" (3,042.41mm)	4.12" (104.65mm)	97th Driest	Driest since: 2009	1956
Jun 2006–May 2010 48-Month	123.90" (3,147.06mm)	119.78" (3,042.41mm)	4.12" (104.65mm)	28th Wettest	Wettest since: 2000	2019
Jun 2005–May 2010 60-Month	152.82" (3,881.63mm)	149.64" (3,800.86mm)	3.18" (80.77mm)	80th Driest	Driest since: 2006	1957
Jun 2005–May 2010 60-Month	152.82" (3,881.63mm)	149.64" (3,800.86mm)	3.18" (80.77mm)	44th Wettest	Wettest since: 2009	2020

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: National Rankings, published May 2023, retrieved on May 30, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/national/rankings