| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F Zone 7b: 5°F to 10°F | |
| 2012 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 | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2e - Eastern Puget Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98019 - Duvall, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 40 | 45 | 50 | 53 | 53 | 49 | 42 | 37 | 33 | 42 |
| Avg Max Temp (°F) | 45 | 50 | 54 | 59 | 65 | 70 | 75 | 76 | 71 | 61 | 50 | 45 | 60 |
| Avg Precip (In.) | 5.71 | 4.36 | 4.76 | 3.45 | 2.79 | 2.27 | 1.34 | 1.57 | 2.45 | 4.09 | 6.39 | 6.46 | 45.66 |