Wallace, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.3 °C (low) to 13.4 °C (high). Annual precipitation averages 982.7 Millimeters. Wallace 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 | -5.2 °C | 1.3 °C | 121.41 mm |
| February | -4.8 °C | 3.6 °C | 87.88 mm |
| March | -2.7 °C | 8 °C | 110.74 mm |
| April | 0 °C | 12.6 °C | 80.77 mm |
| May | 3.7 °C | 18.3 °C | 72.64 mm |
| June | 7 °C | 21.8 °C | 70.61 mm |
| July | 9.3 °C | 27.5 °C | 28.7 mm |
| August | 8.9 °C | 27.6 °C | 26.92 mm |
| September | 5.3 °C | 21.9 °C | 39.12 mm |
| October | 1.1 °C | 13.1 °C | 92.71 mm |
| November | -2.2 °C | 4.9 °C | 131.06 mm |
| December | -5.3 °C | 0.6 °C | 120.14 mm |
| Annual | 1.3 °C | 13.4 °C | 982.7 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |