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 | General Area of Sedimentary Formations Favorable to Oil | Areas of Heavy Groundwater Extraction | Denver Basin | |
|---|---|---|---|---|---|---|---|---|---|
District of Columbia | 100% | ||||||||
Florida | 8.74% | 57.3% | 9.83% | 7.67% | |||||
Idaho | 9.77% | 63.1% | 27.1% | ||||||
New Hampshire | 28.4% | 64.3% | 7.25% | ||||||
Rhode Island | 3.92% | ||||||||
Vermont | 1.65% | 12.1% | 42.6% | 43.7% | |||||
Washington | 20.4% | 5.93% | 1.84% | 17.3% | 5.92% | ||||
Maine | 3.20% | 27.6% | 26.2% | 34.9% | |||||
Virginia | 1.87% | 19.6% | 15.2% | 57.7% | |||||
Delaware | 99.2% | ||||||||
Oregon | 15.6% | 12.0% | 7.32% | 33.9% | 13.8% | ||||
Wisconsin | 13.3% | 86.2% | |||||||
New Jersey | 99.7% | ||||||||
Connecticut | 99.9% | ||||||||
Nevada | 23.7% | 75.4% | |||||||
Massachusetts | 1.97% | 34.1% | 56.1% | ||||||
Georgia | 2.98% | 18.3% | 1.23% | 1.85% | |||||
Maryland | 1.39% | 5.84% | 3.51% | 88.4% | |||||
Québec | 5.65% | 14.9% | 18.6% | 28.5% | |||||
Tennessee | 1.87% | 4.65% | 8.06% | 27.0% | 56.0% | 2.41% | |||
Ontario | 3.62% | 1.52% | 32.9% | 7.70% | |||||
South Dakota | 99.1% | ||||||||
Minnesota | 8.70% | 33.6% | 57.6% | ||||||
Iowa | 29.7% | 70.3% | |||||||
Alaska | 6.62% | 7.64% | 17.8% | 57.5% | 10.9% | ||||
Utah | 1.95% | 15.8% | 45.3% | 1.31% | |||||
Yukon | 3.45% | 13.9% | 65.1% | 6.60% | |||||
Northwest Territories | 3.09% | 1.14% | 3.45% | 47.1% | 70.2% | ||||
Wyoming | 2.07% | 11.7% | 45.2% | 5.90% | |||||
Nunavut | 1.04% | 4.62% | 1.22% | 8.60% | 41.1% | ||||
Montana | 1.56% | 17.8% | 43.0% | 4.26% | 40.7% | ||||
North Dakota | 14.3% | 63.3% | 22.4% | 26.1% | |||||
Kentucky | 2.26% | 32.1% | 60.8% | 2.77% | 69.8% | ||||
Nova Scotia | 40.0% | 23.3% | 11.3% | 99.8% | |||||
Prince Edward Island | 98.5% | 100% | |||||||
Saskatchewan | 21.2% | 57.2% | 2.16% | 26.5% | |||||
Mississippi | 47.6% | 47.1% | 5.25% | 54.2% | |||||
West Virginia | 22.5% | 34.5% | 28.5% | 7.08% | 2.75% | 32.9% | |||
Nebraska | 96.2% | 2.94% | 4.37% | ||||||
Missouri | 1.28% | 85.3% | 13.4% | 4.62% | |||||
Louisiana | 35.0% | 4.64% | 13.3% | 99.9% | |||||
New Brunswick | 5.70% | 12.5% | 20.7% | 57.3% | 26.8% | ||||
Alabama | 49.9% | 33.2% | 16.7% | 20.4% | |||||
New Mexico | 4.55% | 9.09% | 66.0% | 14.0% | |||||
Kansas | 30.5% | 69.5% | 49.5% | ||||||
British Columbia | 1.13% | 3.58% | 2.65% | 43.4% | 4.41% | ||||
Newfoundland and Labrador | 1.73% | 3.63% | 6.73% | 4.58% | 35.7% | 25.6% | |||
Michigan | 2.85% | 57.7% | 12.0% | 31.7% | |||||
Alberta | 74.4% | 24.2% | 61.3% | ||||||
Pennsylvania | 2.54% | 1.92% | 2.00% | 14.5% | 33.4% | ||||
New York | 18.3% | 2.90% | 24.6% | 4.89% | |||||
Manitoba | 7.19% | 44.3% | 2.80% | ||||||
Ohio | 2.15% | 35.4% | 56.5% | 13.5% | |||||
Indiana | 4.86% | 88.4% | 32.9% | ||||||
Arizona | 2.54% | 96.8% | 1.24% | 1 | |||||
Texas | 16.5% | 58.3% | 13.3% | 40.9% | 2 | ||||
North Carolina | 5.96% | 9.63% | 5.85% | 77.5% | 1 | ||||
South Carolina | 2.79% | 2.88% | 93.3% | 1 | |||||
Colorado | 26.0% | 31.5% | 18.2% | 15.2% | 1 | ||||
Oklahoma | 10.5% | 89.5% | 67.6% | 1 | |||||
California | 6.15% | 4.08% | 11.9% | 8.83% | 18.7% | 5.00% | 1 | ||
Arkansas | 13.3% | 86.7% | 14.5% | 1 | |||||
Illinois | 12.2% | 77.2% | 10.6% | 23.0% | 1 | ||||