Camp Three, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 0.7 °C (low) to 16.2 °C (high). Annual precipitation averages 374.9 Millimeters. Camp Three is located in USDA Plant Hardiness Zone 4b. 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 | -9.9 °C | 3.1 °C | 10.92 mm |
| February | -8.8 °C | 4.7 °C | 10.41 mm |
| March | -4.7 °C | 10.1 °C | 18.54 mm |
| April | -0.2 °C | 15.1 °C | 42.42 mm |
| May | 4.9 °C | 20.3 °C | 66.04 mm |
| June | 9.6 °C | 25.4 °C | 72.39 mm |
| July | 13 °C | 31.7 °C | 44.96 mm |
| August | 11.9 °C | 30.6 °C | 27.69 mm |
| September | 6.6 °C | 24.7 °C | 28.7 mm |
| October | 0.8 °C | 16.6 °C | 29.72 mm |
| November | -5.1 °C | 8.6 °C | 11.68 mm |
| December | -9.4 °C | 3.1 °C | 11.43 mm |
| Annual | 0.7 °C | 16.2 °C | 374.9 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |