Rainiest Weather in US

Wettest Places in United States

Most Rainfall

The most rain in the United States and the world falls at Mt. Waialeale on Kauai in Hawaii. It rained an average of 460 inches (11,684 millimetres) a year from 1931 to 1960 on the tropical island mountain. That's over 38 feet (11 metres) of rain.

Several other spots on the Hawaiian Islands top 200 inches (5,080 mm) of rain a year on average, much more than places in any other state besides Alaska.

Mountain View on the east side of Hawaii's Big Island is the rainiest with 240 inches or 20 feet (6.1 metres) annually. At the community on the slope above Hilo it rains 296 days a year – which works out to getting rain on four out of five days.

Highest Total Precipitation

The most rain and snow measured in Alaska is at Little Port Walter on Baranof Island in southeast Alaska. Average precipitation at the inlet amounts to 237 inches a year (6,009 mm), which falls on 233 days annually.

In the lower 48 states, western Washington and the north coast of Oregon are the wettest areas. That's the only area outside of Alaska and Hawaii where yearly precipitation totals over 100 inches (2,540 mm).

The town of Forks, at the northwest corner of Washington State's Olympic Penninsula, is where people living in this region endure the greatest amount of rain.

Still, the most annual precipitation any place in the Pacific Northwest gets is 131 inches, well over 100 inches less than the wettest locations in Hawaii and Alaska.

Places with highest total yearly precipitation averages in the contiguous states
Place Inches Millimetres
Aberdeen Reservoir, Washington 130.6 3317
Laurel Mountain, Oregon 122.3 3106
Forks, Washington 119.7 3041
North Fork Nehalem Park, Oregon 118.9 3020
Mt Rainier, Paradise Station, Washington 118.3 3005
Port Orford, Oregon 117.9 2995
Humptulips, Washington 115.6 2937
Swift Reservoir, Washington 112.7 2864
Naselle, Washington 112.0 2845
Clearwater State Park, Washington 108.9 2766
Baring, Washington 106.7 2710
Grays River Hatchery, Washington 105.6 2683

Most Days With Rain or Snow

While the amount of rain in the Pacific Northwest can't be beat (outside of Alaska and Hawaii), several other places across the nation do get precipitation just as often.

These are the US places in the lower 48 states where it rains or snows on over 200 days a year.

Average number of days a year with rainfall or snowfall
Place Days
Long Beach, Washington 213
Mt Washington, New Hampshire 210
Forks, Washington 210
Snowshoe Mountain, West Virginia 207
Quillayute Airport, Washington 206
South Fork Tolt Reservoir, Washington 205
Mount Mansfield, Vermont 204
Otis, Oregon 204
Marion Center, Pennsylvania 202
Raymond, Washington 201

About the Numbers

The precipitation data here are long-term historical averages based on the weather from 1981 to 2010. The rankings involve 9,179 weather stations in the United States that collect information for the NOAA's National Climatic Data Center. Mt. Waialeale lacks averages for 1981 to 2010.

The number of days with wet weather only includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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