Smelterville, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.1 °C (low) to 14.5 °C (high). Annual precipitation averages 718.3 Millimeters. Smelterville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.5 °C | 1.8 °C | 95.76 mm |
| February | -4.3 °C | 4.3 °C | 70.87 mm |
| March | -2.1 °C | 8.8 °C | 74.42 mm |
| April | 0.8 °C | 14.1 °C | 58.67 mm |
| May | 4.7 °C | 19.7 °C | 63.75 mm |
| June | 8.1 °C | 23.1 °C | 66.8 mm |
| July | 10.4 °C | 28.7 °C | 16.76 mm |
| August | 9.9 °C | 28.8 °C | 19.05 mm |
| September | 6.2 °C | 23 °C | 31.75 mm |
| October | 1.7 °C | 14.1 °C | 55.12 mm |
| November | -1.6 °C | 5.9 °C | 86.11 mm |
| December | -4.5 °C | 1.4 °C | 79.25 mm |
| Annual | 2.1 °C | 14.5 °C | 718.31 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |