USDA Climate Zones
| Zone | Fahrenheit | Celsius | Example Cities |
| 1 | -50 | -45.6 | Fairbanks, Alaska, Resolute, Northwest Territories (Canada) |
| 2a | -50 to -45 | -42.8 to -45.5 | Prudhoe Bay, Alaska, Flin Flon, Manitoba (Canada) |
| 2b | -45 to -40 | -40 to -42.7 | Unalakleet, Alaska, Pinecreek, Minnesota |
| 3a | -40 to -35 | -37.3 to -39.9 | International Falls, Minnesota, St. Michael, Alaska |
| 3b | -35 to -30 | -34.5 to -37.2 | Tomahawk, Wisconsin, Sidney, Montana |
| 4a | -30 to -25 | -31.7 to -34.4 | Minneapolis/St.Paul, Minnesota, Lewistown, Montana |
| 4b | -25 to -20 | -28.9 to -31.6 | Northwood, Iowa, Nebraska |
| 5a | -20 to -15 | -26.2 to -28.8 | Des Moines, Iowa, Illinois |
| 5b | -15 to -10 | -23.4 to -26.1 | Columbia, Missouri, Mansfield, Pennsylvania |
| 6a | -10 to -5 | -20.6 to -23.3 | St. Louis, Missouri, Lebanon, Pennsylvania |
| 6b | -5 to 0 | -17.8 to -20.5 | McMinnville, Tennessee, Branson, Missouri |
| 7a | 0 to 5 | -15 to -17.7 | Oklahoma City, Oklahoma, South Boston, Virginia |
| 7b | 5 to 10 | -12.3 to -14.9 | Little Rock, Arkansas, Griffin, Georgia |
| 8a | 10 to 15 | -9.5 to -12.2 | Tifton, Georgia, Dallas, Texas |
| 8b | 15 to 20 | -6.7 to -9.4 | Austin, Texas, Gainesville, Florida |
| 9a | 20 to 25 | -3.9 to -6.6 | Houston, Texas, St. Augustine, Florida |
| 9b | 25 to 30 | -1.2 to -3.8 | Brownsville, Texas, Fort Pierce, Florida |
| 10a | 30 to 35 | 1.6 to -1.1 | Naples, Florida, Victorville, California |
| 10b | 35 to 40 | 4.4 to 1.7 | Miami, Florida, Coral Gables, Florida |
| 11 | above 40 | above 4.5 | Honolulu, Hawaii, Mazatlan, Mexico |
