Climate Zones
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Climate Zone Descriptions
Use the table below to gain a better understanding of each climate zone.
| Climate Zone |
Name |
Thermal Criteria (SI) |
Thermal Criteria (I-P) |
|
1 |
Very Hot - Humid (1A), Dry (1B) |
5000 < CDD10 C |
9000 < CDD50ºF |
|
2 |
Hot - Humid (2A), Dry (2B) |
3500 < CDD10 C < 5000 |
6300 < CDD50ºF < 9000 |
|
3A,3B |
Warm - Humid (3A), Dry (3B) |
2500 < CDD10 C < 3500 | 4500 < CDD50ºF < 6300 |
|
3C |
Warm - Marine (3C) |
CDD10 C < 2500 & HDD18 C < 2000 |
CDD50ºF < 4500 & 3600 < HDD65ºF < 5400 |
|
4A, 4b |
Mixed - Humid (4A), Dry (4B) |
2500 < CDD10 C & 2000 HDD18 C < 3000 |
3600 < HDD65ºF < 5400 |
|
4C |
Mixed - Marine (4C) |
2000 HDD18 C < 3000 | 5400 < HDD65ºF < 7200 |
|
5 |
Cool - Humid (5A), Dry (5B), |
3000 HDD18 C < 4000 | 7200 < HDD65ºF < 9000 |
|
6 |
Cold - Humid (6A), Dry (6B) |
4000 HDD18 C < 5000 | 9000 < HDD65ºF < 12600 |
|
7 |
Very Cold |
5000 HDD18 C < 7000 | R-35 |
|
8 |
Subarctic |
7000 < HDD18 C | 12600 < HDD65ºF |