Dubois, Idaho has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.1 °F (low) to 55.8 °F (high). Annual precipitation averages 11.3 Inches. Dubois is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.0 °F | 27.4 °F | 0.76 in. |
| February | 12.0 °F | 31.6 °F | 0.58 in. |
| March | 21.0 °F | 43.6 °F | 0.71 in. |
| April | 28.7 °F | 56.1 °F | 1.06 in. |
| May | 36.9 °F | 65.5 °F | 1.99 in. |
| June | 43.5 °F | 74.7 °F | 1.74 in. |
| July | 50.1 °F | 85.5 °F | 0.57 in. |
| August | 48.7 °F | 84.5 °F | 0.53 in. |
| September | 40.2 °F | 73.7 °F | 0.91 in. |
| October | 29.8 °F | 57.6 °F | 0.98 in. |
| November | 19.3 °F | 41.1 °F | 0.61 in. |
| December | 10.5 °F | 28.5 °F | 0.85 in. |
| Annual | 29.1 °F | 55.8 °F | 11.29 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |