Smelterville, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 35.7 °F (low) to 58.1 °F (high). Annual precipitation averages 28.3 Inches. 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 | 23.9 °F | 35.3 °F | 3.77 in. |
| February | 24.2 °F | 39.7 °F | 2.79 in. |
| March | 28.3 °F | 47.8 °F | 2.93 in. |
| April | 33.4 °F | 57.4 °F | 2.31 in. |
| May | 40.5 °F | 67.5 °F | 2.51 in. |
| June | 46.5 °F | 73.5 °F | 2.63 in. |
| July | 50.8 °F | 83.7 °F | 0.66 in. |
| August | 49.9 °F | 83.9 °F | 0.75 in. |
| September | 43.1 °F | 73.4 °F | 1.25 in. |
| October | 35.0 °F | 57.4 °F | 2.17 in. |
| November | 29.2 °F | 42.7 °F | 3.39 in. |
| December | 23.9 °F | 34.6 °F | 3.12 in. |
| Annual | 35.7 °F | 58.1 °F | 28.28 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |