Wash. Admin. Code § 51-11R-30100
R301.1 General. Climate zones from Table R301.1 shall be used in determining the applicable requirements from Chapter 4. Locations not in Table R301.1 (outside the United States) shall be assigned a climate zone based on Section R301.3.
R301.2 Warm humid counties. Warm humid counties are identified in Table R301.1 by an asterisk.
R301.3 International climate zones. The climate zone for any location outside the United States shall be determined by applying Table R301.3(1) and then Table R301.3(2).
TABLE R301.1
CLIMATE ZONES, MOISTURE REGIMES, AND WARM-HUMID
DESIGNATIONS BY STATE AND COUNTY
Key: A - Moist, B - Dry, C - Marine. Absence of moisture designation indicates moisture regime is irrelevant. Asterisk (*) indicates a warm-humid location.
| WASHINGTON | ||
| 5B Adams | 4C Grays Harbor | 4C Pierce |
| 5B Asotin | 4C Island | 4C San Juan |
| 5B Benton | 4C Jefferson | 4C Skagit |
| 5B Chelan | 4C King | 5B Skamania |
| 4C Clallam | 4C Kitsap | 4C Snohomish |
| 4C Clark | 5B Kittitas | 5B Spokane |
| 5B Columbia | 5B Klickitat | 5B Steve |
| 4C Cowlitz | 4C Lewis | 4C Thurston |
| 5B Douglas | 5B Lincoln | 4C Wahkiakum |
| 5B Ferry | 4C Mason | 5B Walla Walla |
| 5B Franklin | 5B Okanogan | 4C Whatcom |
| 5B Garfield | 4C Pacific | 5B Whitman |
| 5B Grant | 5B Pend Oreille | 5B Yakima |
Wash. Admin. Code § 51-11R-30100