| 2023 Hardiness Zone: | Zone 8b: 15°F to 20°F Zone 8a: 10°F to 15°F | |
| 2012 Hardiness Zone: | Zone 8a: 10°F to 15°F | |
| 1990 Hardiness Zone: | Zone 8a: 10F to 15F | |
| Average First Frost Date: | Oct. 21 - Oct. 31 | |
| Average Last Frost Date: | Apr. 11 - Apr. 20 | |
| Koppen-Geiger Climate Zone: | Csb - Warm-Summer Mediterranean Climate | |
| Ecoregion: | 2a - Fraser Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 98264 - Lynden, WA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 32 | 34 | 37 | 40 | 45 | 50 | 52 | 52 | 47 | 41 | 37 | 32 | 42 |
| Avg Max Temp (°F) | 43 | 48 | 53 | 58 | 64 | 69 | 74 | 74 | 70 | 59 | 49 | 44 | 59 |
| Avg Precip (In.) | 6.09 | 5.03 | 4.53 | 3.77 | 3.25 | 2.71 | 1.84 | 1.68 | 2.54 | 4.72 | 7.11 | 6.99 | 50.25 |