| Temperature (C°) |
Zone |
Temperature (F°) |
| below -45.5 |
1 |
below -50 |
| -42.8 to
-45.5 |
2a |
-45 to -50 |
| -40.0 to
-42.7 |
2b |
-40 to -45 |
| -37.3 to
-40.0 |
3a |
-35 to -40 |
| -34.5 to
-37.2 |
3b |
-30 to -35 |
| -31.7 to
-34.4 |
4a |
-25 to -30 |
| -28.9 to
-31.6 |
4b |
-20 to -25 |
| -26.2 to
-28.8 |
5a |
-15 to -20 |
| -23.4 to
-26.1 |
5b |
-10 to -15 |
| -20.6 to
-23.3 |
6a |
-5 to -10 |
| -17.8 to
-20.5 |
6b |
0 to -5 |
| -15.0 to
-17.7 |
7a |
5 to 0 |
| -12.3 to
-15.0 |
7b |
10 to 5 |
| -9.5 to -12.2 |
8a |
15 to 10 |
| -6.7 to -9.4 |
8b |
20 to 15 |
| -3.9 to -6.6 |
9a |
25 to 20 |
| -1.2 to -3.8 |
9b |
30 to 25 |
| 1.6 to -1.1 |
10a |
35 to 30 |
| 4.4 to 1.7 |
10b |
40 to 35 |
| 4.5 and above |
11 |
40 and above |
|
|
