| 2023 Hardiness Zone: | Zone 9a: 20°F to 25°F |
| 2012 Hardiness Zone: | Zone 8b: 15°F to 20°F |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F |
| Average First Frost Date: | November 1 - 10 |
| Average Last Frost Date: | April 1 - 10 |
| 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 98043 - Mountlake Terrace, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 33 | 35 | 37 | 40 | 46 | 50 | 53 | 54 | 49 | 43 | 38 | 34 | 43 |
| Avg Max Temp (°F) | 46 | 50 | 54 | 59 | 65 | 70 | 75 | 76 | 71 | 61 | 51 | 46 | 60 |
| Avg Precip (In.) | 4.81 | 4.06 | 3.88 | 2.79 | 2.09 | 1.77 | 1.02 | 1.07 | 1.85 | 3.43 | 5.49 | 5.73 | 37.99 |