Burlington, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.7 °F (low) to 58.9 °F (high). Annual precipitation averages 37.4 Inches. Burlington is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.2 °F | 46.5 °F | 4.64 in. |
| February | 34.9 °F | 48.4 °F | 3.26 in. |
| March | 37.6 °F | 52.4 °F | 3.63 in. |
| April | 40.9 °F | 57.1 °F | 3.14 in. |
| May | 45.6 °F | 63.5 °F | 2.57 in. |
| June | 49.8 °F | 67.8 °F | 2.07 in. |
| July | 52.1 °F | 73.0 °F | 1.03 in. |
| August | 52.0 °F | 73.9 °F | 1.21 in. |
| September | 48.6 °F | 68.4 °F | 2.17 in. |
| October | 43.0 °F | 58.9 °F | 3.95 in. |
| November | 38.5 °F | 51.0 °F | 5.4 in. |
| December | 34.7 °F | 45.4 °F | 4.28 in. |
| Annual | 42.7 °F | 58.9 °F | 37.35 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 |