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.

Northern Rockies and Plains Climate Region

Precipitation Rankings, May 2012

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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 2012 1-Month	2.17" (55.12mm)	2.62" (66.55mm)	-0.45" (-11.43mm)	37th Driest	Driest since: 2009	1934
May 2012 1-Month	2.17" (55.12mm)	2.62" (66.55mm)	-0.45" (-11.43mm)	92nd Wettest	Wettest since: 2011	2011
Apr–May 2012 2-Month	4.37" (111.00mm)	4.36" (110.74mm)	0.01" (0.26mm)	70th Driest	Driest since: 2009	1934
	4.37" (111.00mm)	4.36" (110.74mm)	0.01" (0.26mm)	59th Wettest	Wettest since: 2011	2011
	Ties: 1902, 1929
Mar–May 2012 3-Month	5.22" (132.59mm)	5.52" (140.21mm)	-0.30" (-7.62mm)	54th Driest	Driest since: 2009	1934
Mar–May 2012 3-Month	5.22" (132.59mm)	5.52" (140.21mm)	-0.30" (-7.62mm)	75th Wettest	Wettest since: 2011	2011
Feb–May 2012 4-Month	6.27" (159.26mm)	6.31" (160.27mm)	-0.04" (-1.01mm)	62nd Driest	Driest since: 2009	1934
	6.27" (159.26mm)	6.31" (160.27mm)	-0.04" (-1.01mm)	67th Wettest	Wettest since: 2011	2011
	Ties: 1945, 1955
Jan–May 2012 5-Month	6.99" (177.55mm)	7.19" (182.63mm)	-0.20" (-5.08mm)	56th Driest	Driest since: 2009	1934
Jan–May 2012 5-Month	6.99" (177.55mm)	7.19" (182.63mm)	-0.20" (-5.08mm)	73rd Wettest	Wettest since: 2011	2011
Dec 2011–May 2012 6-Month	7.61" (193.29mm)	8.06" (204.72mm)	-0.45" (-11.43mm)	44th Driest	Driest since: 2006	1931
	7.61" (193.29mm)	8.06" (204.72mm)	-0.45" (-11.43mm)	84th Wettest	Wettest since: 2011	2011
	Ties: 1914
Nov 2011–May 2012 7-Month	8.38" (212.85mm)	9.01" (228.85mm)	-0.63" (-16.00mm)	39th Driest	Driest since: 2002	1934
Nov 2011–May 2012 7-Month	8.38" (212.85mm)	9.01" (228.85mm)	-0.63" (-16.00mm)	89th Wettest	Wettest since: 2011	2011
Oct 2011–May 2012 8-Month	10.03" (254.76mm)	10.26" (260.60mm)	-0.23" (-5.84mm)	52nd Driest	Driest since: 2006	1934
Oct 2011–May 2012 8-Month	10.03" (254.76mm)	10.26" (260.60mm)	-0.23" (-5.84mm)	76th Wettest	Wettest since: 2011	2011
Sep 2011–May 2012 9-Month	10.76" (273.30mm)	11.84" (300.74mm)	-1.08" (-27.44mm)	27th Driest	Driest since: 2002	1934
Sep 2011–May 2012 9-Month	10.76" (273.30mm)	11.84" (300.74mm)	-1.08" (-27.44mm)	101st Wettest	Wettest since: 2011	2011
Aug 2011–May 2012 10-Month	12.50" (317.50mm)	13.60" (345.44mm)	-1.10" (-27.94mm)	30th Driest	Driest since: 2004	1934
	12.50" (317.50mm)	13.60" (345.44mm)	-1.10" (-27.94mm)	98th Wettest	Wettest since: 2011	2011
	Ties: 1900
Jul 2011–May 2012 11-Month	14.84" (376.94mm)	15.67" (398.02mm)	-0.83" (-21.08mm)	42nd Driest	Driest since: 2006	1934
Jul 2011–May 2012 11-Month	14.84" (376.94mm)	15.67" (398.02mm)	-0.83" (-21.08mm)	86th Wettest	Wettest since: 2011	2011
Jun 2011–May 2012 12-Month	18.20" (462.28mm)	18.62" (472.95mm)	-0.42" (-10.67mm)	49th Driest	Driest since: 2004	1934
	18.20" (462.28mm)	18.62" (472.95mm)	-0.42" (-10.67mm)	79th Wettest	Wettest since: 2011	2011
	Ties: 1979
Dec 2010–May 2012 18-Month	30.38" (771.65mm)	26.68" (677.67mm)	3.70" (93.98mm)	116th Driest	Driest since: 2010	1937
Dec 2010–May 2012 18-Month	30.38" (771.65mm)	26.68" (677.67mm)	3.70" (93.98mm)	11th Wettest	Wettest since: 2011	2011
Jun 2010–May 2012 24-Month	43.37" (1,101.60mm)	37.24" (945.90mm)	6.13" (155.70mm)	123rd Driest	Driest since: 2010	1937
	43.37" (1,101.60mm)	37.24" (945.90mm)	6.13" (155.70mm)	4th Wettest	Wettest since: 2011	2011
	Ties: 2020
Jun 2009–May 2012 36-Month	64.58" (1,640.33mm)	55.80" (1,417.32mm)	8.78" (223.01mm)	123rd Driest	Driest since: 2010	1936
Jun 2009–May 2012 36-Month	64.58" (1,640.33mm)	55.80" (1,417.32mm)	8.78" (223.01mm)	3rd Wettest	Wettest since: 2011	2011
Jun 2008–May 2012 48-Month	84.63" (2,149.60mm)	74.37" (1,889.00mm)	10.26" (260.60mm)	122nd Driest	Driest since: 2010	1937
Jun 2008–May 2012 48-Month	84.63" (2,149.60mm)	74.37" (1,889.00mm)	10.26" (260.60mm)	3rd Wettest	Wettest since: 2011	1996
Jun 2007–May 2012 60-Month	103.17" (2,620.52mm)	92.93" (2,360.42mm)	10.24" (260.10mm)	118th Driest	Driest since: 2010	1937
Jun 2007–May 2012 60-Month	103.17" (2,620.52mm)	92.93" (2,360.42mm)	10.24" (260.10mm)	6th Wettest	Wettest since: 2011	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Regional Rankings, published January 2023, retrieved on February 6, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/regional/rankings