Bennington, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.5 °F (low) to 55 °F (high). Annual precipitation averages 15.9 Inches. 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 | 6.9 °F | 29.1 °F | 1.63 in. |
| February | 8.7 °F | 32.4 °F | 1.4 in. |
| March | 18.0 °F | 41.9 °F | 1.39 in. |
| April | 26.6 °F | 52.2 °F | 1.45 in. |
| May | 34.4 °F | 62.5 °F | 2.13 in. |
| June | 40.8 °F | 72.8 °F | 1.19 in. |
| July | 46.5 °F | 83.2 °F | 0.66 in. |
| August | 45.2 °F | 82.5 °F | 0.85 in. |
| September | 36.3 °F | 72.4 °F | 1.25 in. |
| October | 27.4 °F | 58.1 °F | 1.35 in. |
| November | 18.3 °F | 42.1 °F | 1.25 in. |
| December | 8.8 °F | 30.6 °F | 1.34 in. |
| Annual | 26.5 °F | 55 °F | 15.89 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |