What is the foggiest place in America?

Cape Disappointment, Washington. Fogged in about 106 days of the year.
https://en.wikipedia.org/wiki/Cape_Disappointment_(Washington)

If you are talking about the whole of North America, Newfoundland is dubbed the foggiest place in North America according to:
https://www.farmersalmanac.com/?s=foggiest+place+in+north+america

There seems to be a lot of places claiming this but I have just found the following:

Once a thriving fishing town at the southern tip of the Avalon Peninsula, Trepassey has been named the foggiest place on Earth by the Guinness Book of World Records.

http://gnfeehan.blogspot.com/2018/04/the-irish-loop.html

Argentia is the foggiest place in Canada (206 foggy days per year.)

http://www.thecanadianencyclopedia.ca/en/article/argentia/

If you are referring to the Americas, the foggiest place according the Guinness World Records is Grand Banks, Newfoundland, Canada. I couldn't find a source for Argentia, however they are quite close to each other. Grand Banks juts out into the Atlantic Ocean more than Argentia, which is in Placentia Bay. When fog burns off it starts with the inland areas making its way to the coast, so it makes sense that Grand Banks would be foggy longer. Since I live in the Maritimes, which is not far from Newfoundland, I have seen this kind of weather pattern many times. I also found the following on the internet.

Of all the major Canadian cities, St. John's is the foggiest (124 days, next to Halifax's 122), snowiest (359 cm, next to Quebec City's 343), wettest (1514 mm, next to Halifax's 1491), windiest (24.3 km/h average speed, next to Regina's 20.7), and cloudiest (1497 hours of sunshine, next to Charlottetown's 1818 hours). It also has more days with freezing rain and wet weather than any other city. But the natives are proud of their climate, calling it character-building and invigorating. And they boast that their city happens to have one of the mildest winters in Canada (third mildest city next to Victoria and Vancouver). Perhaps Townies also happen to appreciate a fine weather day more than the rest of Canadians.

http://www.wildnewfoundland.com/inforweather.htm

Cont.

If you are referring to the United States, two places claim to be the foggiest places there.

The foggiest location in the United States is Cape Disappointment, Washington... with nearly three and a half months of thick fog each year.
https://www.farmersalmanac.com/5-foggiest-places-north-america-20735

The Point Reyes Lighthouse, located in the Point Reyes National Seashore. This is considered to be the foggiest spot in the United States... or was it the windiest? Perhaps both. Winds have been recorded up to 130 MPH. That's near hurricane strength if I recall, without the bother of actually having a hurricane.
http://www.lighthousefriends.com/light.asp?ID=66

Cape Disappointment, Washington, with an average of 106 days each year being heavily foggy.

http://www.webmet.com/other.html

The foggiest land areas in the world are Point Reyes, California and Argentia, Newfoundland, both with over 200 foggy days a year.


https://en.wikipedia.org/wiki/Fog

100% no doubt in my mind the Grand Banks and Avalon Peninsula (which includes Trepassey and Argentia.)

http://www.thecanadianencyclopedia.ca/en/article/argentia/

I'm a Newfie (from Conception Bay South, on the Avalon Peninsula) and I've lived away from home for over 4 years in both Canada and the US and I have to say, every time I come back to visit, it never fails that the weather is foggy at LEAST 50% of the time I'm home... and I LOVE it! I'm actually on my way there now and I can't wait to see and smell that good ol' Newfoundland fog off the ocean!

Even as a kid I can remember days when we couldn't even see an outline of a car in the driveway, just nothing but whiteness, and if you were out on the water and the fog rolled in, good luck finding your way back... you'd honestly have to see it to believe it sometimes!

And Brainy Blonde is totally right, we love every bit of our crappy weather :) and you don't realise how much you miss it until you've been away either!

[Links updated and/or removed on November 25, 2016 -- shuehorn]