Acme, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.4 °C (low) to 14.9 °C (high). Annual precipitation averages 1446.8 Millimeters. 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 | 0.3 °C | 6.4 °C | 194.31 mm |
| February | 0.7 °C | 8.2 °C | 112.27 mm |
| March | 2.1 °C | 10.8 °C | 153.67 mm |
| April | 4.1 °C | 14.2 °C | 109.98 mm |
| May | 7.1 °C | 18.2 °C | 89.92 mm |
| June | 9.8 °C | 20.8 °C | 66.8 mm |
| July | 11.4 °C | 24.1 °C | 42.16 mm |
| August | 11.4 °C | 24.7 °C | 34.8 mm |
| September | 8.9 °C | 21.2 °C | 77.72 mm |
| October | 5.7 °C | 15 °C | 157.48 mm |
| November | 2.6 °C | 9.4 °C | 216.66 mm |
| December | 0.3 °C | 6.1 °C | 191.01 mm |
| Annual | 5.4 °C | 14.9 °C | 1446.78 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |