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 1987

View Period (Months):
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  • Record Wettest
Period Value 1901-2000
Mean
Anomaly Rank
(1895-2022)
Wettest/Driest
Since
Record
September 1987
1-Month
0.63"
(16.00mm)
1.24"
(31.50mm)
-0.61"
(-15.50mm)
24th Driest
Driest since:
1979
105th Wettest
Wettest since:
1923
Ties: 2009
Aug–Sep 1987
2-Month
2.02"
(51.31mm)
2.31"
(58.67mm)
-0.29"
(-7.36mm)
56th Driest
Driest since:
2012
73rd Wettest
Wettest since:
1923
Jul–Sep 1987
3-Month
3.99"
(101.35mm)
3.59"
(91.19mm)
0.40"
(10.16mm)
91st Driest
Driest since:
1964
38th Wettest
Wettest since:
1923
Jun–Sep 1987
4-Month
5.51"
(139.95mm)
5.43"
(137.92mm)
0.08"
(2.03mm)
74th Driest
Driest since:
2012
55th Wettest
Wettest since:
1923
May–Sep 1987
5-Month
8.37"
(212.60mm)
7.64"
(194.06mm)
0.73"
(18.54mm)
90th Driest
Driest since:
1919
39th Wettest
Wettest since:
1915
Apr–Sep 1987
6-Month
8.87"
(225.30mm)
9.42"
(239.27mm)
-0.55"
(-13.97mm)
54th Driest
Driest since:
2012
75th Wettest
Wettest since:
1941
Mar–Sep 1987
7-Month
10.14"
(257.56mm)
10.67"
(271.02mm)
-0.53"
(-13.46mm)
51st Driest
Driest since:
2012
78th Wettest
Wettest since:
1941
Feb–Sep 1987
8-Month
11.20"
(284.48mm)
11.63"
(295.40mm)
-0.43"
(-10.92mm)
54th Driest
Driest since:
2012
75th Wettest
Wettest since:
1945
Jan–Sep 1987
9-Month
12.10"
(307.34mm)
12.70"
(322.58mm)
-0.60"
(-15.24mm)
50th Driest
Driest since:
1919
79th Wettest
Wettest since:
1915, 1945
Dec 1986–Sep 1987
10-Month
12.32"
(312.93mm)
13.71"
(348.23mm)
-1.39"
(-35.30mm)
36th Driest
Driest since:
1919
92nd Wettest
Wettest since:
1923
Nov 1986–Sep 1987
11-Month
13.73"
(348.74mm)
14.74"
(374.40mm)
-1.01"
(-25.66mm)
44th Driest
Driest since:
1919
84th Wettest
Wettest since:
1923
Oct 1986–Sep 1987
12-Month
15.52"
(394.21mm)
15.94"
(404.88mm)
-0.42"
(-10.67mm)
57th Driest
Driest since:
1919
71st Wettest
Wettest since:
1995
Apr 1986–Sep 1987
18-Month
25.95"
(659.13mm)
25.35"
(643.89mm)
0.60"
(15.24mm)
71st Driest
Driest since:
2021
57th Wettest
Wettest since:
1945
Oct 1985–Sep 1987
24-Month
33.88"
(860.55mm)
31.88"
(809.75mm)
2.00"
(50.80mm)
90th Driest
Driest since:
2002
37th Wettest
Wettest since:
1998
Oct 1984–Sep 1987
36-Month
46.97"
(1,193.04mm)
47.81"
(1,214.37mm)
-0.84"
(-21.33mm)
54th Driest
Driest since:
2002
72nd Wettest
Wettest since:
1997
Ties: 1970
Oct 1983–Sep 1987
48-Month
65.24"
(1,657.10mm)
63.72"
(1,618.49mm)
1.52"
(38.61mm)
79th Driest
Driest since:
2003
46th Wettest
Wettest since:
1998
Oct 1982–Sep 1987
60-Month
82.38"
(2,092.45mm)
79.56"
(2,020.82mm)
2.82"
(71.63mm)
87th Driest
Driest since:
2004
37th Wettest
Wettest since:
1999

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