Mesa, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 40.1 °F (low) to 64.1 °F (high). Annual precipitation averages 9 Inches. Mesa is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.1 °F | 39.5 °F | 1.18 in. |
| February | 28.5 °F | 46.5 °F | 0.86 in. |
| March | 33.0 °F | 56.3 °F | 0.87 in. |
| April | 37.8 °F | 64.3 °F | 0.77 in. |
| May | 44.9 °F | 73.5 °F | 0.77 in. |
| June | 50.9 °F | 80.1 °F | 0.67 in. |
| July | 56.4 °F | 89.5 °F | 0.23 in. |
| August | 55.9 °F | 88.4 °F | 0.21 in. |
| September | 48.5 °F | 79.2 °F | 0.3 in. |
| October | 39.2 °F | 64.4 °F | 0.79 in. |
| November | 31.7 °F | 49.0 °F | 1.09 in. |
| December | 26.7 °F | 39.0 °F | 1.24 in. |
| Annual | 40.1 °F | 64.1 °F | 8.98 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |