Acme, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 41.6 °F (low) to 58.9 °F (high). Annual precipitation averages 57 Inches. Acme is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.5 °F | 43.6 °F | 7.65 in. |
| February | 33.2 °F | 46.7 °F | 4.42 in. |
| March | 35.7 °F | 51.4 °F | 6.05 in. |
| April | 39.4 °F | 57.6 °F | 4.33 in. |
| May | 44.7 °F | 64.8 °F | 3.54 in. |
| June | 49.6 °F | 69.4 °F | 2.63 in. |
| July | 52.6 °F | 75.3 °F | 1.66 in. |
| August | 52.5 °F | 76.5 °F | 1.37 in. |
| September | 48.1 °F | 70.2 °F | 3.06 in. |
| October | 42.2 °F | 59.0 °F | 6.2 in. |
| November | 36.7 °F | 48.9 °F | 8.53 in. |
| December | 32.5 °F | 42.9 °F | 7.52 in. |
| Annual | 41.6 °F | 58.9 °F | 56.96 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 40-50 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 |