| Zone | Fahrenheit | Example Cities |
|---|---|---|
1 |
Below -50 F |
Fairbanks, Alaska; Resolute, Northwest Territories (Canada) |
2a |
-50 to -45 F |
Prudhoe Bay, Alaska; Flin Flon, Manitoba (Canada) |
2b |
-45 to -40 F |
Unalakleet, Alaska; Pinecreek, Minnesota |
3a |
-40 to -35 F |
International Falls, Minnesota; St. Michael, Alaska |
3b |
-35 to -30 F |
Tomahawk, Wisconsin; Sidney, Montana |
4a |
-30 to -25 F |
Minneapolis/St.Paul, Minnesota; Lewistown, Montana |
4b |
-25 to -20 F |
Northwood, Iowa; Nebraska |
5a |
-20 to -15 F |
Des Moines, Iowa; Illinois |
5b |
-15 to -10 F |
Columbia, Missouri; Mansfield, Pennsylvania |
6a |
-10 to -5 F |
St. Louis, Missouri; Lebanon, Pennsylvania |
6b |
-5 to 0 F |
McMinnville, Tennessee; Branson, Missouri |
7a |
0 to 5 F |
Oklahoma City, Oklahoma; South Boston, Virginia |
7b |
5 to 10 F |
Little Rock, Arkansas; Griffin, Georgia |
8a |
10 to 15 F |
Tifton, Georgia; Dallas, Texas |
8b |
15 to 20 F |
Austin, Texas; Gainesville, Florida |
9a |
20 to 25 F |
Houston, Texas; St. Augustine, Florida |
9b |
25 to 30 F |
Brownsville, Texas; Fort Pierce, Florida |
10a |
30 to 35 F |
Naples, Florida; Victorville, California |
10b |
35 to 40 F |
Miami, Florida; Coral Gables, Florida |
11 |
above 40 F |
Honolulu, Hawaii; Mazatlan, Mexico |
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