Hagerman, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.6 °F (low) to 66.1 °F (high). Annual precipitation averages 9.6 Inches. Hagerman 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 | 22.2 °F | 39.7 °F | 1.32 in. |
| February | 25.1 °F | 46.2 °F | 0.72 in. |
| March | 31.1 °F | 56.8 °F | 0.96 in. |
| April | 35.9 °F | 64.3 °F | 0.83 in. |
| May | 43.7 °F | 74.2 °F | 0.95 in. |
| June | 50.7 °F | 83.7 °F | 0.67 in. |
| July | 56.9 °F | 94.4 °F | 0.17 in. |
| August | 54.1 °F | 92.7 °F | 0.19 in. |
| September | 45.5 °F | 82.6 °F | 0.32 in. |
| October | 36.1 °F | 68.2 °F | 0.71 in. |
| November | 27.8 °F | 51.1 °F | 1.01 in. |
| December | 22.2 °F | 39.5 °F | 1.72 in. |
| Annual | 37.6 °F | 66.1 °F | 9.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |