| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 6b: -5°F to 0°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F Zone 7a: 0°F to 5°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Nov. 1 - Nov. 10 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 77a - North Cascades Lowland Forests | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98284 - Sedro Woolley, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 31 | 33 | 36 | 39 | 44 | 48 | 51 | 51 | 47 | 41 | 36 | 32 | 41 |
| Avg Max Temp (°F) | 44 | 48 | 53 | 58 | 64 | 69 | 74 | 75 | 69 | 60 | 49 | 44 | 59 |
| Avg Precip (In.) | 5.64 | 4.12 | 4.07 | 3.65 | 3.11 | 2.84 | 1.79 | 1.64 | 2.63 | 3.97 | 6.67 | 5.86 | 45.99 |