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 | Settled 1750–1850 | Settled by 1750 | Settled by 1910 | Class | Rank | Million Metric Tons | Chromium Mines | Coastal Plain | Prairie | South Central | Central | Southwest | East Central | North Central | Upper Plains | Coastal | South Central | East Central | Gulf | Upper Delta | Southeast | Northeast | Southwest | East Central | South Central | Southeast | Southwest | Central | Northwest | Central | Northern Valley | South Central | West Central | East Central | North Central | Southeast | Southeast | Piedmont Plateau | Lower Delta | Southwest | Eastern | Northwest | Northeast | Appalachian Mountain | Eastern | Eastern Valley | East Texas | Northwest | West Central | Bootheel | Middle | Northeast | Cumberland Plateau | Northeast | Arkansas Drainage | Western | South Central | Western | Western | Southern Mountains | Southwestern | Edwards Plateau | West Olympic Coast | Puget Sound Lowlands | Central | North Central | Southeast | North Central | Southern | North | East Ozarks | Southeast | Panhandle | Central | West Ozarks | Northwest | West | Southern Coastal Plain | Willamette Valley | Allegheny Plateau | Southeast | Southwestern Mountain | North Central | North Central | East Southeast | Central | Northeastern | Northwestern | East Olympic Cascade Foothills | Lower Valley | Mountain | Southeast | Southwest | West Central | Central | Southwestern Valleys | North Central | Central | Central | West Central | East Central | Northeast | Southwest Plateau | Upper Snake River Plains | West Central | Dixie | Southwest | West Central | North Central | West Central | East Central | South Central | Southwest | Platte Drainage | Blue Grass | South Central | Northwestern | Eastern Highlands | Low Rolling Plains | Northern Cascades | North Central | Northeast | Southwest | West Southwest | East Central | South Central | North Central | Coastal Area | North Coast Drainage | North Central | Southeast | High Plains | Central Mountain | Northern Coastal Plain | Rio Grande Drainage | Southwest | Central Mountains | West Central Plains | South Central | Sacramento Drainage | Northwest Prairie | Southeast | Northeast Prairie | South Central | Southwestern Highlands | Northwest | Snake Drainage | East | Northern Mountains | Southeast | Southern | South Central | Southwestern Valleys | Northwestern Plateau | Northeast | Upper Coast | Southern Desert | East Central | Tidewater | South Central Mountains | North Central Canyons | Central Coastal Plain | Northwest | Northern Mountains | South | South Central | Northeast Interior Basins | Western Piedmont | Panhandle | Northeastern Plains | Central Piedmont | San Joaquin Drainage | Southern Piedmont | Northwest | Southwestern Mountains | North Central Prairies | Central | Green and Bear Drainage | Central Hills | North Central | Eastern Piedmont | Northwest | Trans Pecos | Northeast | Southeast | West Central | Southwest | North Central | Southwest | Central | West Central | Central | South Central | Extreme Southern | Northeast | Cheyenne Niobrara Drainage | Okanogan Big Bend | Southeast Desert Basins | Northern Piedmont | Central Coast Drainage | Southwest | Northern Mountains | Central Plains | Everglades and Southwest Coast | Southeast | Lower Platte | Northwest | High Plateau | Southeastern Plains | Northeast | Upper Platte | Northeast Hills | Northeastern | Northwest | Central Highlands | Central Valley | Cascade Mountains West | Kansas Drainage | South Central | Northeast | Wind River | Northeastern Valleys | Black Hills | North Central | Northwest Plateau | Southwestern | Central Basin | East Central | Northwest | Western Plateau | Lower Southern | Central Mountains | Northeast | South Central | Northeastern | Colorado Drainage | North Central | Upper Southern | Lower East Coast | Middle Susquehanna | Aleutians | Appalachian Mountains | Northeast | Palouse Blue Mountains | Southeastern Shore | North Central | Central | East Slope Cascades | Northeast | Yellowstone Drainage | Southwest Lower | Northeastern Shore | East Central | Southeast | Upper Susquehanna | Lower Susquehanna | Big Horn | South Panhandle | Central Eastern Shore | Belle Fourche Drainage | Panhandle | Powder, Little Mo and Tongue Drainages | North Central | South Central | Northern | North Central | South Central | Uinta Basin | Southwest | Central Lakes | South Coast Drainage | South Central Lower | East Upper | South Central | Eastern Plateau | Southeast Lower | Southeast | Southwest | Great Lakes | Southeast | Western | Southern | Northeast Gulf | Southeastern | Southwest | Central | Mohawk Valley | Northwest | West Central Lower | East Central | West | Southeast | Southeastern Piedmont | East Central Lower | Northern | Northwest | East Central Mountains | Pocono Mountains | Coastal | Coastal | Central | Central | South Central | Coastal | North Central | Central Lower | South | Rhode Island (Entire State) | West Upper | Northeast | Central | Southern | East Central | Coastal | Coastal | Northeastern | Hudson Valley | North Central | Southeastern | Northeast Lower | Southwest | West Central | Northern | Northeast | Champlain Valley | Northern Plateau | Northwest Lower | Central | South Interior | North | Northwest Gulf | North | Northeastern | Western | West Central | Northwest | East Central | North Central | Northeast | Southeast | Central | Northwest | Central | South Central | West Central | Northeast | North Central | Cook Inlet | Southeast Interior | St | East Central | Northwest | North Central | Bristol Bay | West Coast | Northeast Interior | Central Interior | North Slope | |
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3.14% | 5.14% | 5.38% | 18.2% | 41.6% | 24.4% | 29.2% | 11.2% | 25.5% | 48.333333333333336 |