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On this page you will find statistics for the monsoon for various locations from across the Mojave Desert and southern Great Basin. The monsoon is officially defined as the period from June 15th through September 30th in Arizona. Although Nevada and California do not have an officially defined monsoon season, these dates were used for stations here as well.

Percent of Normal Annual Precipitation Associated With The Monsoon

Monsoon Percent Of Normal Annual Precipitation

The map above shows the percentage of the normal annual precipitation at a given location associated with the North American Monsoon for the period of June 15th through September 30th. The monsoon accounts for as much as 40 percent of the normal annual precipitation in parts of the Mojave Desert to less than 10 percent of the normal annual precipitation in parts of the southern Great Basin.


Normal Total Precipitation Associated With The Monsoon

Monsoon Season Normal Total Precipitation

The map above shows the normal total precipitation associated with the North American Monsoon for the period of June 15th through September 30th.


Monsoon Season Precipitation Statistics

Below is a table showing the total normal precipitation for the monsoon season, the wettest monsoon ever since records started, the driest ever since records started and the year records began for each site for the monsoon. Tied records are noted by a *.

Location Normal Wettest / Year Driest / Year Records Started
Amargosa Valley, NV 0.94 4.92 / 1984 0.00 / 2010* 1966
Boulder City, NV 1.64 9.00 / 1984 0.02 / 2000 1932
Bunkerville, NV 1.27 5.13 / 1984 0.20 / 2004 1980
Caliente, NV 2.44 8.44 / 1984 Trace / 1944 1903
Desert NWR, NV 1.37 6.05 / 1984 0.00 / 1993* 1940
Desert Rock Airport, NV 1.74 6.79 / 1976 0.01 / 2010 1978
Dyer, NV 1.22 5.16 / 1976 Trace / 1907 1903
Elgin, NV 2.59 10.17 / 1998 0.60 / 1995 1986
Goldfield, NV 1.71 6.55 / 1913 Trace / 1907 1906
Hiko, NV 1.61 4.13 / 2013 0.17 / 2002 1989
Las Vegas/McCarran Airport, NV 1.01 4.16 / 1984 Trace / 1944 1937
Las Vegas NWS Office, NV 1.61 4.46 / 1998 0.12 / 2006 1997
Laughlin, NV 1.46 3.08 / 1988 Trace / 1995 1988
Mesquite, NV 2.75 5.24 / 2012 0.00 / 1944 1942
Mt. Charleston, NV 6.32 23.50 / 1984 1.39 / 2010 1980
North Las Vegas Airport, NV 1.32 1.62 / 2011 Trace / 2001 2001
North Las Vegas Co-Op, NV 1.00 3.45 / 1967 0.02 / 2001 1951
Overton, NV 1.15 3.73 / 1939 0.00 / 1944 1939
Pahranagat NWR, NV 1.46 6.04 / 1984 0.05 / 1996 1964
Pahrump, NV 1.19 4.08 / 1984 0.00 / 1959 1914
Pioche, NV 3.23 9.20 / 1970 0.22 / 1944 1888
Searchlight, NV 2.25 12.08 / 1939 0.09 / 1973 1914
Silver Peak, NV 1.19 5.07 / 1976 0.02 / 1987 1968
Spring Mountain Ranch, NV 2.42 9.70 / 1983 0.00 / 1996* 1977
Spring Valley State Park, NV 3.37 9.92 / 1998 0.00 / 1996 1974
Valley of Fire, NV 1.66 5.74 / 1998 0.09 / 1973 1973
Baker, CA 1.12 3.49 / 1997 0.00 / 1978* 1953
Barstow-Daggett, CA 0.96 5.07 / 1958 0.00 / 1944 1944
Bishop, CA 0.58 2.52 / 1982 Trace / 2003* 1944
Death Valley, CA 0.44 1.91 / 1936 0.00 / 1993* 1911
Haiwee, CA 1.09 5.30 / 1984 0.00 / 2002* 1923
Independence, CA 0.45 3.43 / 2013 0.00 / 2010* 1862
Iron Mountain, CA 0.97 7.38 / 1939 0.00 / 1944 1935
Joshua Tree, CA 1.13 3.32 / 1967 Trace / 2010* 1959
Mountain Pass, CA 3.85 7.79 / 1984 0.10 / 2010 1955
Needles, CA 1.08 10.29 / 1939 Trace / 1944 1888
Parker Reservoir, CA 1.64 8.54 / 1939 Trace / 2001 1934
Trona, CA 0.52 3.67 / 1984 0.00 / 2010* 1920
Twentynine Palms, CA 1.70 6.35 / 1997 0.00 / 1988* 1935
Beaver Dam, AZ 1.65 3.87 / 1998 0.21 / 1996 1952
Bullhead City, AZ 1.39 5.94 / 1983 0.01 / 2001 1978
Colorado City, AZ 4.27 12.68 / 1998 0.75 / 1978 1950
Diamond M Ranch, AZ 5.67 13.84 / 2014 2.44 / 2010 1999
Kingman, AZ 2.71 9.83 / 1984 0.04 / 1928 1901
Lake Havasu City, AZ 0.85 3.76 / 1983 0.00 / 1996* 1967
Pipe Spring Nat'l Monument, AZ 4.82 7.72 / 1997 1.15 / 2009 1963
Wikieup, AZ 2.38 12.17 / 1939 0.04 / 1956 1925
Yucca, AZ 2.12 6.60 / 1984 0.32 / 1995 1953


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