Wardner, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.7 °C (low) to 13.4 °C (high). Annual precipitation averages 969.3 Millimeters. Wardner is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.8 °C | 1.4 °C | 111.76 mm |
| February | -4.4 °C | 3.6 °C | 89.15 mm |
| March | -2.4 °C | 7.9 °C | 113.03 mm |
| April | 0.4 °C | 12.6 °C | 83.31 mm |
| May | 4.2 °C | 18.2 °C | 77.22 mm |
| June | 7.4 °C | 21.8 °C | 74.42 mm |
| July | 9.8 °C | 27.5 °C | 25.65 mm |
| August | 9.4 °C | 27.6 °C | 25.4 mm |
| September | 5.8 °C | 21.8 °C | 37.34 mm |
| October | 1.3 °C | 12.9 °C | 83.31 mm |
| November | -1.9 °C | 5 °C | 127.76 mm |
| December | -4.9 °C | 0.7 °C | 120.9 mm |
| Annual | 1.7 °C | 13.4 °C | 969.25 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 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 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |