Moccasin, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.3 °C (low) to 13.4 °C (high). Annual precipitation averages 382 Millimeters. Moccasin is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 2.3 °C | 11.18 mm |
| February | -9.2 °C | 2.8 °C | 10.16 mm |
| March | -5.6 °C | 7.3 °C | 16 mm |
| April | -1.6 °C | 11.7 °C | 36.32 mm |
| May | 3.1 °C | 16.7 °C | 66.55 mm |
| June | 7.4 °C | 21.3 °C | 69.09 mm |
| July | 10.5 °C | 27.3 °C | 42.42 mm |
| August | 9.9 °C | 27.2 °C | 41.91 mm |
| September | 5.4 °C | 21.2 °C | 35.81 mm |
| October | 0 °C | 13.7 °C | 26.92 mm |
| November | -5.1 °C | 6.7 °C | 14.73 mm |
| December | -8.8 °C | 2.4 °C | 10.92 mm |
| Annual | -0.3 °C | 13.4 °C | 382.01 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |