Statewide Rankings

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Please note, Degree Days and Palmer Indices are not available for Alaska. Palmer Drought Severity Index (PDSI), Palmer Hydrological Drought Index (PHDI), and Palmer Modified Drought Index (PMDI) are not offered for multiple-month time scales.

Wyoming

Precipitation Rankings, September 1940

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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
September 1940 1-Month	2.43" (61.72mm)	1.24" (31.50mm)	1.19" (30.22mm)	121st Driest	Driest since: 1939	1979
September 1940 1-Month	2.43" (61.72mm)	1.24" (31.50mm)	1.19" (30.22mm)	8th Wettest	Wettest since: 1923	1923
Aug–Sep 1940 2-Month	2.91" (73.91mm)	2.31" (58.67mm)	0.60" (15.24mm)	102nd Driest	Driest since: 1939	2012
Aug–Sep 1940 2-Month	2.91" (73.91mm)	2.31" (58.67mm)	0.60" (15.24mm)	27th Wettest	Wettest since: 1930	1923
Jul–Sep 1940 3-Month	3.97" (100.84mm)	3.59" (91.19mm)	0.38" (9.65mm)	89th Driest	Driest since: 1939	1964
Jul–Sep 1940 3-Month	3.97" (100.84mm)	3.59" (91.19mm)	0.38" (9.65mm)	40th Wettest	Wettest since: 1938	1923
Jun–Sep 1940 4-Month	5.33" (135.38mm)	5.43" (137.92mm)	-0.10" (-2.54mm)	69th Driest	Driest since: 1939	2012
	5.33" (135.38mm)	5.43" (137.92mm)	-0.10" (-2.54mm)	60th Wettest	Wettest since: 1938	1923
	Ties: 1958
May–Sep 1940 5-Month	6.17" (156.72mm)	7.64" (194.06mm)	-1.47" (-37.34mm)	28th Driest	Driest since: 1939	1919
May–Sep 1940 5-Month	6.17" (156.72mm)	7.64" (194.06mm)	-1.47" (-37.34mm)	101st Wettest	Wettest since: 1938	1915
Apr–Sep 1940 6-Month	9.22" (234.19mm)	9.42" (239.27mm)	-0.20" (-5.08mm)	63rd Driest	Driest since: 1939	2012
Apr–Sep 1940 6-Month	9.22" (234.19mm)	9.42" (239.27mm)	-0.20" (-5.08mm)	66th Wettest	Wettest since: 1938	1941
Mar–Sep 1940 7-Month	10.31" (261.87mm)	10.67" (271.02mm)	-0.36" (-9.15mm)	57th Driest	Driest since: 1939	2012
	10.31" (261.87mm)	10.67" (271.02mm)	-0.36" (-9.15mm)	72nd Wettest	Wettest since: 1938	1941
	Ties: 1972
Feb–Sep 1940 8-Month	11.54" (293.12mm)	11.63" (295.40mm)	-0.09" (-2.28mm)	67th Driest	Driest since: 1939	2012
Feb–Sep 1940 8-Month	11.54" (293.12mm)	11.63" (295.40mm)	-0.09" (-2.28mm)	62nd Wettest	Wettest since: 1938	1945
Jan–Sep 1940 9-Month	13.15" (334.01mm)	12.70" (322.58mm)	0.45" (11.43mm)	77th Driest	Driest since: 1939	1919
Jan–Sep 1940 9-Month	13.15" (334.01mm)	12.70" (322.58mm)	0.45" (11.43mm)	52nd Wettest	Wettest since: 1938	1915, 1945
Dec 1939–Sep 1940 10-Month	13.66" (346.96mm)	13.71" (348.23mm)	-0.05" (-1.27mm)	66th Driest	Driest since: 1939	1919
Dec 1939–Sep 1940 10-Month	13.66" (346.96mm)	13.71" (348.23mm)	-0.05" (-1.27mm)	62nd Wettest	Wettest since: 1938	1923
Nov 1939–Sep 1940 11-Month	13.68" (347.47mm)	14.74" (374.40mm)	-1.06" (-26.93mm)	43rd Driest	Driest since: 1939	1919
Nov 1939–Sep 1940 11-Month	13.68" (347.47mm)	14.74" (374.40mm)	-1.06" (-26.93mm)	85th Wettest	Wettest since: 1938	1923
Oct 1939–Sep 1940 12-Month	14.63" (371.60mm)	15.94" (404.88mm)	-1.31" (-33.28mm)	38th Driest	Driest since: 1939	1919
Oct 1939–Sep 1940 12-Month	14.63" (371.60mm)	15.94" (404.88mm)	-1.31" (-33.28mm)	90th Wettest	Wettest since: 1938	1995
Apr 1939–Sep 1940 18-Month	21.54" (547.12mm)	25.35" (643.89mm)	-3.81" (-96.77mm)	20th Driest	Driest since: 1935	2021
Apr 1939–Sep 1940 18-Month	21.54" (547.12mm)	25.35" (643.89mm)	-3.81" (-96.77mm)	108th Wettest	Wettest since: 1939	1945
Oct 1938–Sep 1940 24-Month	28.09" (713.49mm)	31.88" (809.75mm)	-3.79" (-96.26mm)	22nd Driest	Driest since: 1935	2002
Oct 1938–Sep 1940 24-Month	28.09" (713.49mm)	31.88" (809.75mm)	-3.79" (-96.26mm)	105th Wettest	Wettest since: 1939	1998
Oct 1937–Sep 1940 36-Month	45.54" (1,156.72mm)	47.81" (1,214.37mm)	-2.27" (-57.65mm)	36th Driest	Driest since: 1936	2002
Oct 1937–Sep 1940 36-Month	45.54" (1,156.72mm)	47.81" (1,214.37mm)	-2.27" (-57.65mm)	90th Wettest	Wettest since: 1939	1997
Oct 1936–Sep 1940 48-Month	62.59" (1,589.79mm)	63.72" (1,618.49mm)	-1.13" (-28.70mm)	56th Driest	Driest since: 1937	2003
Oct 1936–Sep 1940 48-Month	62.59" (1,589.79mm)	63.72" (1,618.49mm)	-1.13" (-28.70mm)	69th Wettest	Wettest since: 1939	1998
Oct 1935–Sep 1940 60-Month	77.37" (1,965.20mm)	79.56" (2,020.82mm)	-2.19" (-55.62mm)	47th Driest	Driest since: 1938	2004
Oct 1935–Sep 1940 60-Month	77.37" (1,965.20mm)	79.56" (2,020.82mm)	-2.19" (-55.62mm)	77th Wettest	Wettest since: 1939	1999

Citing This Page

NOAA National Centers for Environmental information, Climate at a Glance: Statewide Rankings, published May 2023, retrieved on June 1, 2023 from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/statewide/rankings