Atomic City, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 27.5 °F (low) to 57 °F (high). Annual precipitation averages 8.3 Inches. Atomic City is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.6 °F | 27.4 °F | 0.55 in. |
| February | 10.2 °F | 31.9 °F | 0.43 in. |
| March | 20.3 °F | 44.7 °F | 0.64 in. |
| April | 27.3 °F | 56.3 °F | 0.78 in. |
| May | 35.5 °F | 66.0 °F | 1.44 in. |
| June | 42.2 °F | 76.4 °F | 0.88 in. |
| July | 49.1 °F | 88.0 °F | 0.45 in. |
| August | 47.3 °F | 86.4 °F | 0.53 in. |
| September | 38.3 °F | 75.3 °F | 0.67 in. |
| October | 27.8 °F | 59.5 °F | 0.86 in. |
| November | 17.1 °F | 42.7 °F | 0.46 in. |
| December | 8.0 °F | 29.2 °F | 0.57 in. |
| Annual | 27.5 °F | 57 °F | 8.26 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |