Jerome, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.2 °F (low) to 62.4 °F (high). Annual precipitation averages 10.4 Inches. Jerome is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.1 °F | 36.8 °F | 1.31 in. |
| February | 23.9 °F | 42.3 °F | 0.77 in. |
| March | 29.9 °F | 52.8 °F | 1.06 in. |
| April | 34.8 °F | 60.3 °F | 1.04 in. |
| May | 42.8 °F | 69.9 °F | 1.29 in. |
| June | 50.0 °F | 79.5 °F | 0.63 in. |
| July | 57.2 °F | 90.1 °F | 0.13 in. |
| August | 55.1 °F | 88.6 °F | 0.27 in. |
| September | 46.7 °F | 78.4 °F | 0.43 in. |
| October | 36.6 °F | 64.2 °F | 0.9 in. |
| November | 27.5 °F | 48.7 °F | 1.04 in. |
| December | 21.2 °F | 36.9 °F | 1.55 in. |
| Annual | 37.2 °F | 62.4 °F | 10.42 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |