Midvale, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 2.5 °C (low) to 17.3 °C (high). Annual precipitation averages 466.3 Millimeters. 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 | -7.1 °C | 1.3 °C | 69.6 mm |
| February | -5 °C | 5.3 °C | 48.26 mm |
| March | -1.1 °C | 12 °C | 49.53 mm |
| April | 1.8 °C | 16.9 °C | 35.81 mm |
| May | 6.2 °C | 22.5 °C | 43.43 mm |
| June | 9.8 °C | 27.2 °C | 29.46 mm |
| July | 13.8 °C | 33.9 °C | 9.14 mm |
| August | 12.4 °C | 33.4 °C | 6.86 mm |
| September | 7.3 °C | 27.3 °C | 13.97 mm |
| October | 1.6 °C | 18.1 °C | 28.7 mm |
| November | -3.1 °C | 8.3 °C | 50.8 mm |
| December | -6.4 °C | 1.9 °C | 80.77 mm |
| Annual | 2.5 °C | 17.3 °C | 466.33 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |