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
