Bellingham, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43.3 °F (low) to 58.9 °F (high). Annual precipitation averages 37.3 Inches. 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 | 34.9 °F | 45.8 °F | 4.97 in. |
| February | 35.2 °F | 48.1 °F | 3.18 in. |
| March | 37.8 °F | 52.1 °F | 3.78 in. |
| April | 41.3 °F | 58.0 °F | 2.96 in. |
| May | 46.1 °F | 64.2 °F | 2.37 in. |
| June | 50.5 °F | 68.4 °F | 1.76 in. |
| July | 53.1 °F | 73.5 °F | 1.04 in. |
| August | 53.1 °F | 73.8 °F | 1.05 in. |
| September | 49.5 °F | 68.5 °F | 2.01 in. |
| October | 44.1 °F | 59.3 °F | 3.91 in. |
| November | 38.8 °F | 50.5 °F | 5.65 in. |
| December | 34.8 °F | 45.1 °F | 4.64 in. |
| Annual | 43.3 °F | 58.9 °F | 37.32 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |