Burien, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44 °F (low) to 60.2 °F (high). Annual precipitation averages 43.2 Inches. Burien is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.9 °F | 46.5 °F | 6.07 in. |
| February | 35.8 °F | 49.0 °F | 4.3 in. |
| March | 38.0 °F | 53.0 °F | 4.77 in. |
| April | 41.3 °F | 58.4 °F | 3.54 in. |
| May | 46.6 °F | 65.4 °F | 2.11 in. |
| June | 50.9 °F | 69.8 °F | 1.66 in. |
| July | 54.5 °F | 76.5 °F | 0.75 in. |
| August | 54.8 °F | 76.8 °F | 0.92 in. |
| September | 51.2 °F | 70.9 °F | 1.6 in. |
| October | 44.9 °F | 60.0 °F | 4.52 in. |
| November | 39.1 °F | 50.9 °F | 6.52 in. |
| December | 35.5 °F | 45.6 °F | 6.44 in. |
| Annual | 44 °F | 60.2 °F | 43.2 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |