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, December 1999

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  • Record Wettest
Period Value 1901-2000
Mean		 Anomaly Rank
(1895-2022)		 Wettest/Driest
Since		 Record
December 1999
1-Month 		0.78"
(19.81mm)		 1.01"
(25.65mm)		 -0.23"
(-5.84mm)		 37th Driest
Driest since:
 1986
92nd Wettest
Wettest since:
 1964, 1996
Ties: 1931, 1953, 1957
Nov–Dec 1999
2-Month 		1.36"
(34.54mm)		 2.05"
(52.07mm)		 -0.69"
(-17.53mm)		 16th Driest
Driest since:
 1914
113th Wettest
Wettest since:
 1983
Oct–Dec 1999
3-Month 		1.75"
(44.45mm)		 3.24"
(82.30mm)		 -1.49"
(-37.85mm)		 6th Driest
Driest since:
 1976
123rd Wettest
Wettest since:
 1942
Sep–Dec 1999
4-Month 		3.29"
(83.57mm)		 4.48"
(113.79mm)		 -1.19"
(-30.22mm)		 16th Driest
Driest since:
 1952
113th Wettest
Wettest since:
 2013
Aug–Dec 1999
5-Month 		4.33"
(109.98mm)		 5.55"
(140.97mm)		 -1.22"
(-30.99mm)		 22nd Driest
Driest since:
 1904
107th Wettest
Wettest since:
 1923
Jul–Dec 1999
6-Month 		5.14"
(130.56mm)		 6.83"
(173.48mm)		 -1.69"
(-42.92mm)		 18th Driest
Driest since:
 1939
111th Wettest
Wettest since:
 1923
Jun–Dec 1999
7-Month 		7.31"
(185.67mm)		 8.67"
(220.22mm)		 -1.36"
(-34.55mm)		 30th Driest
Driest since:
 1935
99th Wettest
Wettest since:
 1923
May–Dec 1999
8-Month 		9.49"
(241.05mm)		 10.88"
(276.35mm)		 -1.39"
(-35.30mm)		 39th Driest
Driest since:
 1900
90th Wettest
Wettest since:
 1923
Apr–Dec 1999
9-Month 		12.80"
(325.12mm)		 12.66"
(321.56mm)		 0.14"
(3.56mm)		 71st Driest
Driest since:
 1954
58th Wettest
Wettest since:
 1941
Mar–Dec 1999
10-Month 		13.55"
(344.17mm)		 13.91"
(353.31mm)		 -0.36"
(-9.14mm)		 60th Driest
Driest since:
 2012
69th Wettest
Wettest since:
 1941
Feb–Dec 1999
11-Month 		14.72"
(373.89mm)		 14.88"
(377.95mm)		 -0.16"
(-4.06mm)		 64th Driest
Driest since:
 2012
65th Wettest
Wettest since:
 1941
Jan–Dec 1999
12-Month 		15.94"
(404.88mm)		 15.94"
(404.88mm)		 0.00"
(0.00mm)		 63rd Driest
Driest since:
 2012
66th Wettest
Wettest since:
 1927
Jul 1998–Dec 1999
18-Month 		25.25"
(641.35mm)		 22.77"
(578.36mm)		 2.48"
(62.99mm)		 102nd Driest
Driest since:
 1934
26th Wettest
Wettest since:
 1927
Jan 1998–Dec 1999
24-Month 		35.51"
(901.95mm)		 31.87"
(809.50mm)		 3.64"
(92.45mm)		 110th Driest
Driest since:
 2002
18th Wettest
Wettest since:
 1983
Jan 1997–Dec 1999
36-Month 		53.49"
(1,358.65mm)		 47.82"
(1,214.63mm)		 5.67"
(144.02mm)		 116th Driest
Driest since:
 2002
11th Wettest
Wettest since:
 1947
Ties: 1908
Jan 1996–Dec 1999
48-Month 		70.79"
(1,798.07mm)		 63.72"
(1,618.49mm)		 7.07"
(179.58mm)		 119th Driest
Driest since:
 2003
7th Wettest
Wettest since:
 1998
Jan 1995–Dec 1999
60-Month 		91.07"
(2,313.18mm)		 79.58"
(2,021.33mm)		 11.49"
(291.85mm)		 124th Driest
Driest since:
 1935
1st Wettest
Wettest to Date
 1999

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