Days with Heavy Fog
North AmericaPhysical EnvironmentAverage annual number of days in North America with heavy fog, where fog has made driving conditions dangerous
natureA map illustrates the distribution of days with heavy fog across North America using a color-coded scheme.
Areas with 80 days or more of heavy fog are shaded in dark blue, prominently seen in some parts of northern Canada and the western coast of the United States. Regions with 60 days of heavy fog are shaded in purple, visible in some areas of northern Alaska and northeastern Canada, including regions of Victoria Islands, Parry Islands, and Naujaat. Areas experiencing 40 days of heavy fog are shaded in pink, found in parts of extreme eastern Canada, including Ellesmere, the Canadian Arctic Archipelago, Nunavut, and some coastal regions of the northern United States. Regions with 20 days of heavy fog are shaded in orange, noticeable in parts of the western and northeastern United States, and most of the eastern coast, as well as in northern Canada. Areas with 10 days of heavy fog are shaded in yellow, observed in many parts of the United States and Canada including South Dakota, North Dakota, Iowa, Illinois, Kentucky, Tennessee, Dallas, Montana, New York, Calgary, Newfoundland and Labrador, Manitoba, Yellowknife, Northern Territories, Yukon, Fairbanks, Alaska, Nome, Whitehorse, Juneau, New Mexico.
80 and over | 60–79 | 40–59 | 20–39 | 10–19 | Under 10 | Value | Class | Rank | Million Metric Tons | Value | Arches | Aulavik National Park of Canada | Auyuittuq National Park of Canada | Badlands | Banff National Park of Canada | Bering Land Bridge National Park | Big Bend | Canyonlands | Cape Breton Highlands National Park of Canada | Capitol Reef | Channel Islands | Congaree | Crater Lake | Death Valley | Denali | Everglades | Fundy National Park of Canada | Glacier Bay | Glacier National Park of Canada | Glacier | Grand Canyon | Grand Teton | Great Basin | Great Sand Dunes | Great Smoky Mountains | Gros Morne National Park of Canada | Gwaii Haanas National Park Reserve of Canada and Haida Heritage Site | Haleakala | Hawai'i Volcanoes | Isle Royale | Ivvavik National Park of Canada | Jasper National Park of Canada | Joshua Tree | Kejimkujik National Park and National Historic Site of Canada | Kenai Fjords | Kings Canyon | Kluane National Park Reserve of Canada | Kobuk Valley | Kootenay National Park of Canada | Kouchibouguac National Park of Canada | Lassen Volcanic | Mammoth Cave | Mealy Mountains National Park Reserve | Mount Rainier | Nááts'ihch'oh National Park Reserve of Canada | Nahanni National Park Reserve of Canada | North Cascades | Olympic | Parc national Kuururjuaq | Parc national Tursujuq | Prince Albert National Park of Canada | Pukaskwa National Park of Canada | Qausuittuq National Park of Canada | Quttinirpaaq National Park of Canada | Redwood | Riding Mountain National Park of Canada | Rocky Mountain | Saguaro | Shenandoah | Sirmilik National Park of Canada | Theodore Roosevelt | Torngat Mountains National Park Reserve of Canada | Tuktut Nogait National Park of Canada | Ukkusiksalik National Park of Canada | Vuntut National Park of Canada | Wapusk National Park of Canada | Wood Buffalo National Park of Canada | Yellowstone | Yoho National Park of Canada | Yosemite | Zion | |
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| 3.14% | 5.14% | 5.38% | 18.2% | 41.6% | 24.4% | 0.132% | 1.27% | 0.759% | 0.211% | 0.921% | 0.777% | 0.422% | 0.602% | 1.74% | 0.414% | 0.108% | 0.118% | 0.283% | 1.93% | 1.58% | 2.68% | 0.241% | 0.595% | 0.127% | 1.09% | 1.65% | 0.426% | 0.115% | 0.316% | 0.934% | 0.426% | 0.112% | 0.380% | 7.64% | 0.404% | 2.50% | 1.59% | 0.737% | 0.681% | 0.139% | 0.837% | 4.12% | 0.527% | 0.129% | 0.277% | 0.115% | 0.152% | 2.69% | 0.544% | 0.314% | 1.87% | 1.18% | 2.07% | 0.319% | 1.85% | 0.603% | 0.169% | 0.597% | 3.97% | 0.113% | 0.423% | 0.399% | 0.108% | 0.738% | 1.16% | 0.137% | 2.69% | 1.55% | 0.646% | 1.08% | 1.76% | 1.98% | 1.35% | 0.127% | 0.741% | 0.258% | ||||||