Annual Wyoming rainfall, severe weather and climate data

Driest location ranked by lowest annual precipitation: Lysite, central Wyoming, 5.11"

Wettest location ranked by highest annual precipitation: Snake River, western Wyoming, 31.54"

Snowiest location ranked by highest annual snowfall: Bechler Ranger Station, northwestern Wyoming, 285.0"

State precipitation record for 24 hours - Cheyenne, southeastern Wyoming, 8/1/1985, 6.06"

State precipitation record for 1 year - Grassy Lake Dam, western Wyoming, 1945, 55.46"

State snowfall record for 24 hours - Glenrock, central Wyoming, 4/19/1973, 41.0"

State snow record for 1 season - Bechler River, northwestern Wyoming, 1932-1933, 491.6"

Wyoming is the seventh most earthquake-prone state in the nation

Although Wyoming is the third driest state in the nation, Lander, Wyoming is the seventh snowiest city in the
U.S. with 102.5 inches of snowfall per year

Cheyenne, Wyoming is considered to have the cleanest air in the nation, based on long-term particle pollution

Wyoming temperature averages and extremes, precipitation and temperature data for all U.S. states and
interesting Top 10 U.S. climate extremes

Data sources: National Climatic Data Center, Severe thunderstorm / tornado watch data period is 1999 - 2008, NOAA Storm Prediction Center, Tornado climate data - NOAA Storm Prediction Center, State lightning flash density average - 1997-2011, Vaisala

City	Avg Annual Precip	Avg Annual Snow	Avg # days of Precip	Avg # thunderstorm days	Avg # hail days	Avg # severe thunderstorm watches per year	Avg # tornado watches per year	# of tornadoes reported in county, 1960-2010
Casper	13.03	76.9	95	34	3	1	3	32
Cheyenne	15.45	56.1	100	41	3	2	6	99
Lander	13.42	99.6	72	32	2	0	1	18
Sheridan	14.72	71.4	107	33	1	2	7	9
Wyoming Annual Precipitation Average - 12.97", 48th wettest in the U.S. Wyoming Tornado Average - 9.8 per year - 25th most in the U.S. Largest reported Tornado in Wyoming from 1950-2011, 7/21/1987 - 2,550 yards / 1.4 miles wide Date with highest number of reported Tornadoes in Wyoming from 1950-2011, June 14th - 21 tornadoes Average time of occurrence of reported Tornadoes in Wyoming from 1950-2011 - 3:40 pm Wyoming Annual Lightning Density - 3.1 flashes per square mile - 37th highest in U.S. Record Driest year in Wyoming from 1895-2012 - 2012, avg precipitation 8.08 inches Record Wettest year in Wyoming from 1895-2012 - 1923, avg precipitation 18.35 inches