Bennington, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -3.1 °C (low) to 12.8 °C (high). Annual precipitation averages 403.6 Millimeters. Bennington is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.9 °C | -1.6 °C | 41.4 mm |
| February | -12.9 °C | 0.2 °C | 35.56 mm |
| March | -7.8 °C | 5.5 °C | 35.31 mm |
| April | -3 °C | 11.2 °C | 36.83 mm |
| May | 1.3 °C | 16.9 °C | 54.1 mm |
| June | 4.9 °C | 22.7 °C | 30.23 mm |
| July | 8.1 °C | 28.4 °C | 16.76 mm |
| August | 7.3 °C | 28.1 °C | 21.59 mm |
| September | 2.4 °C | 22.4 °C | 31.75 mm |
| October | -2.6 °C | 14.5 °C | 34.29 mm |
| November | -7.6 °C | 5.6 °C | 31.75 mm |
| December | -12.9 °C | -0.8 °C | 34.04 mm |
| Annual | -3.1 °C | 12.8 °C | 403.61 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |