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 2020

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
September 2020
1-Month 		0.82"
(20.83mm)		 1.24"
(31.50mm)		 -0.42"
(-10.67mm)		 40th Driest
Driest since:
 1979
89th Wettest
Wettest since:
 1923
Aug–Sep 2020
2-Month 		1.12"
(28.45mm)		 2.31"
(58.67mm)		 -1.19"
(-30.22mm)		 6th Driest
Driest since:
 2012
123rd Wettest
Wettest since:
 1923
Ties: 1964
Jul–Sep 2020
3-Month 		1.81"
(45.97mm)		 3.59"
(91.19mm)		 -1.78"
(-45.22mm)		 2nd Driest
Driest since:
 1964
127th Wettest
Wettest since:
 1923
Jun–Sep 2020
4-Month 		3.48"
(88.39mm)		 5.43"
(137.92mm)		 -1.95"
(-49.53mm)		 11th Driest
Driest since:
 2012
118th Wettest
Wettest since:
 1923
May–Sep 2020
5-Month 		4.73"
(120.14mm)		 7.64"
(194.06mm)		 -2.91"
(-73.92mm)		 6th Driest
Driest since:
 1919
123rd Wettest
Wettest since:
 1915
Apr–Sep 2020
6-Month 		6.05"
(153.67mm)		 9.42"
(239.27mm)		 -3.37"
(-85.60mm)		 7th Driest
Driest since:
 2012
122nd Wettest
Wettest since:
 1941
Mar–Sep 2020
7-Month 		7.08"
(179.83mm)		 10.67"
(271.02mm)		 -3.59"
(-91.19mm)		 7th Driest
Driest since:
 2012
122nd Wettest
Wettest since:
 1941
Feb–Sep 2020
8-Month 		8.29"
(210.57mm)		 11.63"
(295.40mm)		 -3.34"
(-84.83mm)		 11th Driest
Driest since:
 2012
118th Wettest
Wettest since:
 1945
Jan–Sep 2020
9-Month 		9.31"
(236.47mm)		 12.70"
(322.58mm)		 -3.39"
(-86.11mm)		 10th Driest
Driest since:
 1919
119th Wettest
Wettest since:
 1915, 1945
Dec 2019–Sep 2020
10-Month 		10.12"
(257.05mm)		 13.71"
(348.23mm)		 -3.59"
(-91.18mm)		 8th Driest
Driest since:
 1919
120th Wettest
Wettest since:
 1923
Ties: 1934
Nov 2019–Sep 2020
11-Month 		11.20"
(284.48mm)		 14.74"
(374.40mm)		 -3.54"
(-89.92mm)		 10th Driest
Driest since:
 1919
118th Wettest
Wettest since:
 1923
Oct 2019–Sep 2020
12-Month 		12.39"
(314.71mm)		 15.94"
(404.88mm)		 -3.55"
(-90.17mm)		 12th Driest
Driest since:
 1919
116th Wettest
Wettest since:
 1995
Apr 2019–Sep 2020
18-Month 		24.08"
(611.63mm)		 25.35"
(643.89mm)		 -1.27"
(-32.26mm)		 50th Driest
Driest since:
 2021
78th Wettest
Wettest since:
 1945
Oct 2018–Sep 2020
24-Month 		31.00"
(787.40mm)		 31.88"
(809.75mm)		 -0.88"
(-22.35mm)		 53rd Driest
Driest since:
 2002
74th Wettest
Wettest since:
 1998
Oct 2017–Sep 2020
36-Month 		47.06"
(1,195.32mm)		 47.81"
(1,214.37mm)		 -0.75"
(-19.05mm)		 57th Driest
Driest since:
 2002
69th Wettest
Wettest since:
 1997
Oct 2016–Sep 2020
48-Month 		66.90"
(1,699.26mm)		 63.72"
(1,618.49mm)		 3.18"
(80.77mm)		 90th Driest
Driest since:
 2003
35th Wettest
Wettest since:
 1998
Oct 2015–Sep 2020
60-Month 		83.02"
(2,108.71mm)		 79.56"
(2,020.82mm)		 3.46"
(87.89mm)		 90th Driest
Driest since:
 2004
34th Wettest
Wettest since:
 1999

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