Lacey, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42 °F (low) to 60.8 °F (high). Annual precipitation averages 54.8 Inches. Lacey is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.6 °F | 46.7 °F | 7.98 in. |
| February | 34.1 °F | 49.6 °F | 5.11 in. |
| March | 36.2 °F | 54.0 °F | 5.96 in. |
| April | 39.0 °F | 58.8 °F | 4.12 in. |
| May | 44.4 °F | 65.8 °F | 2.56 in. |
| June | 48.9 °F | 70.3 °F | 1.83 in. |
| July | 52.4 °F | 77.1 °F | 0.7 in. |
| August | 52.4 °F | 77.8 °F | 1.27 in. |
| September | 48.2 °F | 72.2 °F | 2.03 in. |
| October | 42.5 °F | 60.6 °F | 5.2 in. |
| November | 37.3 °F | 51.3 °F | 9.66 in. |
| December | 34.1 °F | 45.7 °F | 8.39 in. |
| Annual | 42 °F | 60.8 °F | 54.81 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 50-75 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 |