Kirkland, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.2 °F (low) to 60.6 °F (high). Annual precipitation averages 39.8 Inches. Kirkland is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.8 °F | 46.9 °F | 5.36 in. |
| February | 35.8 °F | 49.6 °F | 3.8 in. |
| March | 38.1 °F | 53.6 °F | 4.2 in. |
| April | 41.5 °F | 58.7 °F | 3.22 in. |
| May | 46.9 °F | 65.6 °F | 2.12 in. |
| June | 51.2 °F | 69.9 °F | 1.86 in. |
| July | 54.7 °F | 76.4 °F | 0.79 in. |
| August | 54.9 °F | 77.0 °F | 1.0 in. |
| September | 51.1 °F | 71.1 °F | 1.68 in. |
| October | 45.0 °F | 60.4 °F | 3.95 in. |
| November | 39.3 °F | 51.4 °F | 5.98 in. |
| December | 35.5 °F | 46.0 °F | 5.86 in. |
| Annual | 44.2 °F | 60.6 °F | 39.82 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |