Average Annual Precipitation by State

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How much precipitation each state in the US gets on average in a year is listed below. The states are also ranked from the wettest state at number 1, to the driest state at number 50.

State-wide averages of annual rainfall plus snowfall range from a high of 63.7 inches (1618 millimetres) in Hawaii to a low of 9.5 inches (241 millimetres) in Nevada. For the entire United States, excluding Hawaii and Alaska, the average amount of moisture falling as rain and snow is 30.21 inches (767 millimetres).

The precipitation averages are based on data collected by weather stations throughout each state from 1971 to 2000 and provided by the NOAA National Climatic Data Center.

Average total yearly precipitation for each state.
State Inches Millimetres Rank
Alabama58.31480  4
Alaska22.5  57239
Arizona13.6  34547
Arkansas50.61284  8
California22.2  56340
Colorado15.9  40544
Connecticut50.31279  9
Delaware45.7116016
Florida54.51385  5
Georgia50.71287  7
Hawaii63.71618  1
Idaho18.9  48142
Illinois39.2  99627
Indiana41.7106026
Iowa34.0  86431
Kansas28.9  73335
Kentucky48.9124212
Louisiana60.11528  2
Maine42.2107223
Maryland44.5113118
Massachusetts47.7121114
Michigan32.8  83332
Minnesota27.3  69337
Mississippi59.01499  3
Missouri42.2107124
State Inches Millimetres Rank
Montana15.3  39045
Nebraska23.6  59938
Nevada  9.5  24150
New Hampshire43.4110320
New Jersey47.1119615
New Mexico14.6  37046
New York41.8106225
North Carolina50.31279  9
North Dakota17.8  45243
Ohio39.1  99328
Oklahoma36.5  92730
Oregon27.4  69536
Pennsylvania42.9108921
Rhode Island47.9121813
South Carolina49.8126411
South Dakota20.1  51141
Tennessee54.21376  6
Texas28.9  73434
Utah12.2  31049
Vermont42.7108522
Virginia44.3112519
Washington38.4  97629
West Virginia45.2114717
Wisconsin32.6  82933
Wyoming12.9  32848
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