Average Number of Tornado Incidences per Year (U.S.)
North AmericaPhysical EnvironmentTornado prevalence in the United States per 1,000 square miles per year
Tornado ArchiveA map shows average tornado incidences per year in the U.S. The highest incidences (dark brown) are in Oklahoma, parts of Texas, Kansas, and Missouri. The lowest incidences (light yellow) are in Alaska, Washington, Oregon, and California.
Less than 1 | 1–5 | 6–10 | 11–15 | More than 15 | Tropical Forests | Oil Slicks (1990s) | |
|---|---|---|---|---|---|---|---|
Arizona | 92.2% | 7.76% | |||||
Utah | 100% | ||||||
Idaho | 100% | ||||||
Wyoming | 87.7% | 12.3% | |||||
Montana | 100% | ||||||
North Dakota | 29.5% | 70.5% | |||||
Nebraska | 88.6% | 11.4% | |||||
Missouri | 23.4% | 62.5% | 14.1% | ||||
Oregon | 100% | ||||||
New Mexico | 90.2% | 9.71% | |||||
Kansas | 68.1% | 31.5% | |||||
Wisconsin | 13.1% | 53.1% | 33.7% | ||||
South Carolina | 99.9% | ||||||
Michigan | 34.8% | 64.8% | |||||
Colorado | 69.4% | 30.6% | |||||
Nevada | 100% | ||||||
Oklahoma | 3.41% | 35.1% | 46.0% | 15.5% | |||
California | 99.9% | ||||||
South Dakota | 22.1% | 76.0% | 1.85% | ||||
Minnesota | 23.4% | 72.5% | 4.03% | ||||
Iowa | 50.0% | 50.0% | |||||
Alaska | 99.8% | 0.113% | |||||
District of Columbia | 100% | 100% | |||||
Florida | 64.2% | 35.5% | 1.15% | 0.837% | |||
New Hampshire | 1.24% | 98.7% | 57.6% | ||||
Rhode Island | 99.3% | 95.0% | |||||
Vermont | 77.1% | 22.6% | 5.93% | ||||
Washington | 99.9% | 0.496% | |||||
Maine | 40.0% | 59.8% | 5.06% | ||||
Kentucky | 4.42% | 60.5% | 35.1% | 39.9% | |||
Nova Scotia | 1.05% | ||||||
Virginia | 10.3% | 89.6% | 62.1% | ||||
Delaware | 99.2% | 99.3% | |||||
Prince Edward Island | 0.308% | ||||||
Mississippi | 10.9% | 74.0% | 15.1% | 29.7% | |||
West Virginia | 48.2% | 51.8% | 3.63% | ||||
Texas | 16.8% | 43.9% | 36.9% | 2.38% | 19.3% | ||
Louisiana | 30.4% | 69.5% | 89.8% | ||||
Hawaii | 92.1% | 1.73% | |||||
North Carolina | 99.9% | 16.0% | |||||
Alabama | 69.5% | 16.4% | 14.0% | 8.82% | |||
British Columbia | 2.52% | 0.210% | |||||
New Jersey | 19.5% | 80.3% | 99.2% | ||||
Connecticut | 99.9% | 99.9% | |||||
Pennsylvania | 6.15% | 93.9% | 24.2% | ||||
Massachusetts | 99.5% | 98.1% | |||||
Georgia | 61.5% | 38.5% | 0.104% | ||||
New York | 61.6% | 38.3% | 26.9% | ||||
Maryland | 99.3% | 76.4% | |||||
Tennessee | 41.3% | 58.7% | 1.03% | ||||
Ontario | 2.30% | ||||||
Arkansas | 87.2% | 12.8% | 0.397% | ||||
Ohio | 3.97% | 96.0% | 18.7% | ||||
Indiana | 62.9% | 37.1% | 44.2% | ||||
Illinois | 70.3% | 29.6% | 6.79% | ||||
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