Mineral, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4 °C (low) to 14.3 °C (high). Annual precipitation averages 2061.2 Millimeters. Mineral is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.3 °C | 6.1 °C | 338.84 mm |
| February | -0.3 °C | 7.5 °C | 211.33 mm |
| March | 0.8 °C | 10 °C | 271.02 mm |
| April | 2.3 °C | 13.3 °C | 155.19 mm |
| May | 5.4 °C | 17.8 °C | 99.57 mm |
| June | 7.7 °C | 20.4 °C | 74.68 mm |
| July | 9.9 °C | 24.2 °C | 27.18 mm |
| August | 10 °C | 24.4 °C | 37.34 mm |
| September | 7.4 °C | 20.6 °C | 60.96 mm |
| October | 4 °C | 13.7 °C | 181.1 mm |
| November | 1.2 °C | 8.6 °C | 308.1 mm |
| December | -0.6 °C | 5.4 °C | 295.91 mm |
| Annual | 4 °C | 14.3 °C | 2061.22 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |