Bellingham, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.3 °C (low) to 15 °C (high). Annual precipitation averages 947.9 Millimeters. Bellingham is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 7.7 °C | 126.24 mm |
| February | 1.8 °C | 8.9 °C | 80.77 mm |
| March | 3.2 °C | 11.2 °C | 96.01 mm |
| April | 5.2 °C | 14.4 °C | 75.18 mm |
| May | 7.8 °C | 17.9 °C | 60.2 mm |
| June | 10.3 °C | 20.2 °C | 44.7 mm |
| July | 11.7 °C | 23.1 °C | 26.42 mm |
| August | 11.7 °C | 23.2 °C | 26.67 mm |
| September | 9.7 °C | 20.3 °C | 51.05 mm |
| October | 6.7 °C | 15.2 °C | 99.31 mm |
| November | 3.8 °C | 10.3 °C | 143.51 mm |
| December | 1.6 °C | 7.3 °C | 117.86 mm |
| Annual | 6.3 °C | 15 °C | 947.92 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |