Denton, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.3 °F (low) to 57.7 °F (high). Annual precipitation averages 15.8 Inches. Denton is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.7 °F | 36.1 °F | 0.42 in. |
| February | 13.6 °F | 37.9 °F | 0.47 in. |
| March | 20.7 °F | 46.3 °F | 0.71 in. |
| April | 29.0 °F | 55.3 °F | 1.62 in. |
| May | 37.9 °F | 64.6 °F | 2.72 in. |
| June | 45.6 °F | 72.8 °F | 3.11 in. |
| July | 50.9 °F | 83.1 °F | 1.6 in. |
| August | 49.4 °F | 82.9 °F | 1.47 in. |
| September | 40.9 °F | 72.3 °F | 1.36 in. |
| October | 30.5 °F | 58.6 °F | 1.16 in. |
| November | 20.5 °F | 45.3 °F | 0.63 in. |
| December | 12.7 °F | 36.6 °F | 0.5 in. |
| Annual | 30.3 °F | 57.7 °F | 15.77 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |