Emmett, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3.9 °C (low) to 18.1 °C (high). Annual precipitation averages 290.8 Millimeters. Emmett is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.6 °C | 3.4 °C | 37.34 mm |
| February | -2.8 °C | 7.9 °C | 28.19 mm |
| March | 0.1 °C | 13.7 °C | 34.29 mm |
| April | 2.6 °C | 17.5 °C | 25.4 mm |
| May | 7.1 °C | 22.7 °C | 30.48 mm |
| June | 10.8 °C | 27.4 °C | 18.03 mm |
| July | 14.6 °C | 33.4 °C | 5.84 mm |
| August | 13.5 °C | 32.6 °C | 3.81 mm |
| September | 8.8 °C | 26.8 °C | 11.18 mm |
| October | 3.1 °C | 18.7 °C | 18.29 mm |
| November | -1.6 °C | 9.7 °C | 29.72 mm |
| December | -4.6 °C | 3.9 °C | 48.26 mm |
| Annual | 3.9 °C | 18.1 °C | 290.83 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |