Midvale, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 36.5 °F (low) to 63.2 °F (high). Annual precipitation averages 18.4 Inches. Midvale is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.2 °F | 34.3 °F | 2.74 in. |
| February | 23.0 °F | 41.6 °F | 1.9 in. |
| March | 30.0 °F | 53.6 °F | 1.95 in. |
| April | 35.3 °F | 62.5 °F | 1.41 in. |
| May | 43.1 °F | 72.5 °F | 1.71 in. |
| June | 49.6 °F | 81.0 °F | 1.16 in. |
| July | 56.8 °F | 93.0 °F | 0.36 in. |
| August | 54.4 °F | 92.1 °F | 0.27 in. |
| September | 45.1 °F | 81.1 °F | 0.55 in. |
| October | 34.8 °F | 64.6 °F | 1.13 in. |
| November | 26.5 °F | 47.0 °F | 2.0 in. |
| December | 20.4 °F | 35.5 °F | 3.18 in. |
| Annual | 36.5 °F | 63.2 °F | 18.36 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |