Mineral, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 39.1 °F (low) to 57.8 °F (high). Annual precipitation averages 81.2 Inches. 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 | 31.5 °F | 42.9 °F | 13.34 in. |
| February | 31.4 °F | 45.5 °F | 8.32 in. |
| March | 33.4 °F | 50.0 °F | 10.67 in. |
| April | 36.2 °F | 55.9 °F | 6.11 in. |
| May | 41.7 °F | 64.0 °F | 3.92 in. |
| June | 45.8 °F | 68.7 °F | 2.94 in. |
| July | 49.9 °F | 75.5 °F | 1.07 in. |
| August | 50.0 °F | 76.0 °F | 1.47 in. |
| September | 45.4 °F | 69.0 °F | 2.4 in. |
| October | 39.2 °F | 56.6 °F | 7.13 in. |
| November | 34.2 °F | 47.5 °F | 12.13 in. |
| December | 30.9 °F | 41.8 °F | 11.65 in. |
| Annual | 39.1 °F | 57.8 °F | 81.15 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |