Hammett, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 38.9 °F (low) to 67.2 °F (high). Annual precipitation averages 9 Inches. Hammett is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.4 °F | 41.0 °F | 1.44 in. |
| February | 26.8 °F | 48.1 °F | 0.69 in. |
| March | 32.1 °F | 57.7 °F | 0.86 in. |
| April | 36.7 °F | 65.3 °F | 0.74 in. |
| May | 44.8 °F | 75.2 °F | 0.91 in. |
| June | 51.3 °F | 84.5 °F | 0.55 in. |
| July | 58.4 °F | 96.0 °F | 0.17 in. |
| August | 56.1 °F | 94.2 °F | 0.2 in. |
| September | 47.0 °F | 83.5 °F | 0.26 in. |
| October | 36.5 °F | 68.5 °F | 0.68 in. |
| November | 28.7 °F | 52.0 °F | 0.91 in. |
| December | 23.7 °F | 40.9 °F | 1.56 in. |
| Annual | 38.9 °F | 67.2 °F | 8.97 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |