Banks, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 1.9 °C (low) to 17.1 °C (high). Annual precipitation averages 600.7 Millimeters. Banks is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.6 °C | 2.8 °C | 88.14 mm |
| February | -4.9 °C | 6.6 °C | 61.47 mm |
| March | -1.7 °C | 11.6 °C | 66.29 mm |
| April | 0.9 °C | 16.1 °C | 54.86 mm |
| May | 4.9 °C | 21.4 °C | 57.15 mm |
| June | 8.3 °C | 26.2 °C | 34.29 mm |
| July | 12 °C | 32.6 °C | 10.67 mm |
| August | 11.1 °C | 32 °C | 8.64 mm |
| September | 6.7 °C | 26.4 °C | 17.02 mm |
| October | 1.3 °C | 18.1 °C | 40.39 mm |
| November | -2.8 °C | 8.6 °C | 65.02 mm |
| December | -6.2 °C | 2.9 °C | 96.77 mm |
| Annual | 1.9 °C | 17.1 °C | 600.71 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |