| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate |
| Ecoregion: | 2f - Central Puget Lowland |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98303 - Anderson Island, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 34 | 35 | 37 | 39 | 45 | 49 | 52 | 53 | 48 | 43 | 38 | 34 | 42 |
| Avg Max Temp (°F) | 45 | 49 | 54 | 59 | 66 | 70 | 76 | 77 | 71 | 60 | 50 | 45 | 60 |
| Avg Precip (In.) | 6.53 | 5.62 | 4.87 | 3.12 | 2.02 | 1.67 | .92 | 1.17 | 1.89 | 3.96 | 7.28 | 7.47 | 46.53 |