Mountain Home, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3.7 °C (low) to 18.2 °C (high). Annual precipitation averages 259.6 Millimeters. Mountain Home is located in USDA Plant Hardiness Zone 7a. 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 | -4.8 °C | 4 °C | 33.53 mm |
| February | -3.3 °C | 7.6 °C | 21.08 mm |
| March | -0.4 °C | 12.8 °C | 29.21 mm |
| April | 2.2 °C | 16.8 °C | 22.86 mm |
| May | 6.5 °C | 22.3 °C | 31.24 mm |
| June | 10.3 °C | 27.4 °C | 15.49 mm |
| July | 14.7 °C | 34 °C | 3.81 mm |
| August | 13.7 °C | 33.2 °C | 2.79 mm |
| September | 8.8 °C | 27.3 °C | 11.43 mm |
| October | 3.1 °C | 18.9 °C | 19.05 mm |
| November | -1.8 °C | 9.8 °C | 26.67 mm |
| December | -4.8 °C | 4 °C | 42.42 mm |
| Annual | 3.7 °C | 18.2 °C | 259.58 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |