Nooksack, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.2 °F (low) to 59.7 °F (high). Annual precipitation averages 47.1 Inches. Nooksack is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.2 °F | 44.5 °F | 6.22 in. |
| February | 34.1 °F | 47.9 °F | 3.66 in. |
| March | 36.6 °F | 52.4 °F | 4.86 in. |
| April | 40.3 °F | 58.6 °F | 3.83 in. |
| May | 45.7 °F | 65.6 °F | 3.08 in. |
| June | 50.3 °F | 69.9 °F | 2.31 in. |
| July | 52.8 °F | 75.8 °F | 1.44 in. |
| August | 52.4 °F | 76.8 °F | 1.34 in. |
| September | 48.1 °F | 70.9 °F | 2.64 in. |
| October | 42.7 °F | 59.7 °F | 5.19 in. |
| November | 37.4 °F | 49.9 °F | 6.8 in. |
| December | 33.1 °F | 43.8 °F | 5.77 in. |
| Annual | 42.2 °F | 59.7 °F | 47.14 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |