Fort Hall, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 32.9 °F (low) to 59.4 °F (high). Annual precipitation averages 10.4 Inches. Fort Hall is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.1 °F | 32.9 °F | 0.89 in. |
| February | 19.0 °F | 37.8 °F | 0.7 in. |
| March | 26.7 °F | 49.2 °F | 1.02 in. |
| April | 31.6 °F | 58.1 °F | 1.06 in. |
| May | 39.2 °F | 67.4 °F | 1.42 in. |
| June | 45.6 °F | 76.6 °F | 0.99 in. |
| July | 51.3 °F | 87.4 °F | 0.39 in. |
| August | 49.9 °F | 86.8 °F | 0.51 in. |
| September | 42.2 °F | 76.5 °F | 0.85 in. |
| October | 32.6 °F | 61.3 °F | 0.94 in. |
| November | 23.7 °F | 45.7 °F | 0.76 in. |
| December | 16.3 °F | 33.6 °F | 0.9 in. |
| Annual | 32.9 °F | 59.4 °F | 10.43 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |