Statewide Rankings

Statewide Data Info
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 1947

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 1947
1-Month 		1.24"
(31.50mm)		 1.24"
(31.50mm)		 0.00"
(0.00mm)		 73rd Driest
Driest since:
 1979
56th Wettest
Wettest since:
 1923
Aug–Sep 1947
2-Month 		2.50"
(63.50mm)		 2.31"
(58.67mm)		 0.19"
(4.83mm)		 79th Driest
Driest since:
 2012
50th Wettest
Wettest since:
 1923
Jul–Sep 1947
3-Month 		3.45"
(87.63mm)		 3.59"
(91.19mm)		 -0.14"
(-3.56mm)		 70th Driest
Driest since:
 1964
59th Wettest
Wettest since:
 1923
Ties: 1980
Jun–Sep 1947
4-Month 		7.42"
(188.47mm)		 5.43"
(137.92mm)		 1.99"
(50.55mm)		 116th Driest
Driest since:
 2012
13th Wettest
Wettest since:
 1923
May–Sep 1947
5-Month 		10.00"
(254.00mm)		 7.64"
(194.06mm)		 2.36"
(59.94mm)		 119th Driest
Driest since:
 1919
10th Wettest
Wettest since:
 1915
Apr–Sep 1947
6-Month 		11.88"
(301.75mm)		 9.42"
(239.27mm)		 2.46"
(62.48mm)		 116th Driest
Driest since:
 2012
13th Wettest
Wettest since:
 1941
Mar–Sep 1947
7-Month 		12.95"
(328.93mm)		 10.67"
(271.02mm)		 2.28"
(57.91mm)		 112th Driest
Driest since:
 2012
17th Wettest
Wettest since:
 1941
Feb–Sep 1947
8-Month 		13.90"
(353.06mm)		 11.63"
(295.40mm)		 2.27"
(57.66mm)		 114th Driest
Driest since:
 2012
15th Wettest
Wettest since:
 1945
Jan–Sep 1947
9-Month 		14.74"
(374.40mm)		 12.70"
(322.58mm)		 2.04"
(51.82mm)		 107th Driest
Driest since:
 1919
22nd Wettest
Wettest since:
 1915, 1945
Dec 1946–Sep 1947
10-Month 		15.81"
(401.57mm)		 13.71"
(348.23mm)		 2.10"
(53.34mm)		 106th Driest
Driest since:
 1919
22nd Wettest
Wettest since:
 1923
Ties: 1908, 1973
Nov 1946–Sep 1947
11-Month 		16.80"
(426.72mm)		 14.74"
(374.40mm)		 2.06"
(52.32mm)		 107th Driest
Driest since:
 1919
21st Wettest
Wettest since:
 1923
Ties: 1984
Oct 1946–Sep 1947
12-Month 		19.27"
(489.46mm)		 15.94"
(404.88mm)		 3.33"
(84.58mm)		 120th Driest
Driest since:
 1919
8th Wettest
Wettest since:
 1995
Apr 1946–Sep 1947
18-Month 		29.24"
(742.70mm)		 25.35"
(643.89mm)		 3.89"
(98.81mm)		 115th Driest
Driest since:
 2021
13th Wettest
Wettest since:
 1945
Oct 1945–Sep 1947
24-Month 		36.12"
(917.45mm)		 31.88"
(809.75mm)		 4.24"
(107.70mm)		 118th Driest
Driest since:
 2002
9th Wettest
Wettest since:
 1998
Oct 1944–Sep 1947
36-Month 		55.75"
(1,416.05mm)		 47.81"
(1,214.37mm)		 7.94"
(201.68mm)		 123rd Driest
Driest since:
 2002
3rd Wettest
Wettest to Date
 1997
Oct 1943–Sep 1947
48-Month 		73.27"
(1,861.06mm)		 63.72"
(1,618.49mm)		 9.55"
(242.57mm)		 123rd Driest
Driest since:
 2003
2nd Wettest
Wettest to Date
 1998
Oct 1942–Sep 1947
60-Month 		91.15"
(2,315.21mm)		 79.56"
(2,020.82mm)		 11.59"
(294.39mm)		 122nd Driest
Driest since:
 2004
2nd Wettest
Wettest to Date
 1999

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