| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 9a: 20°F to 25°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 1 - Apr. 10 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2c - San Juan Islands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98250 - Friday Harbor, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 35 | 36 | 38 | 41 | 45 | 48 | 50 | 51 | 49 | 44 | 39 | 35 | 43 |
| Avg Max Temp (°F) | 45 | 48 | 52 | 57 | 62 | 66 | 70 | 70 | 66 | 58 | 50 | 45 | 57 |
| Avg Precip (In.) | 4.38 | 3.11 | 2.31 | 1.6 | 1.42 | 1.23 | .83 | .98 | 1.27 | 2.46 | 4.7 | 4.65 | 28.95 |