Atomic City, Idaho has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -2.5 °C (low) to 13.9 °C (high). Annual precipitation averages 209.8 Millimeters. 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 | -14.1 °C | -2.6 °C | 13.97 mm |
| February | -12.1 °C | -0.1 °C | 10.92 mm |
| March | -6.5 °C | 7.1 °C | 16.26 mm |
| April | -2.6 °C | 13.5 °C | 19.81 mm |
| May | 1.9 °C | 18.9 °C | 36.58 mm |
| June | 5.7 °C | 24.7 °C | 22.35 mm |
| July | 9.5 °C | 31.1 °C | 11.43 mm |
| August | 8.5 °C | 30.2 °C | 13.46 mm |
| September | 3.5 °C | 24.1 °C | 17.02 mm |
| October | -2.3 °C | 15.3 °C | 21.84 mm |
| November | -8.3 °C | 5.9 °C | 11.68 mm |
| December | -13.3 °C | -1.6 °C | 14.48 mm |
| Annual | -2.5 °C | 13.9 °C | 209.8 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |