Denton, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1 °C (low) to 14.3 °C (high). Annual precipitation averages 400.6 Millimeters. 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 | -11.3 °C | 2.3 °C | 10.67 mm |
| February | -10.2 °C | 3.3 °C | 11.94 mm |
| March | -6.3 °C | 7.9 °C | 18.03 mm |
| April | -1.7 °C | 12.9 °C | 41.15 mm |
| May | 3.3 °C | 18.1 °C | 69.09 mm |
| June | 7.6 °C | 22.7 °C | 78.99 mm |
| July | 10.5 °C | 28.4 °C | 40.64 mm |
| August | 9.7 °C | 28.3 °C | 37.34 mm |
| September | 4.9 °C | 22.4 °C | 34.54 mm |
| October | -0.8 °C | 14.8 °C | 29.46 mm |
| November | -6.4 °C | 7.4 °C | 16 mm |
| December | -10.7 °C | 2.6 °C | 12.7 mm |
| Annual | -1 °C | 14.3 °C | 400.55 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |