Marysville, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 28.4 °F (low) to 52.1 °F (high). Annual precipitation averages 21 Inches. Marysville is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.2 °F | 31.5 °F | 1.15 in. |
| February | 13.1 °F | 34.0 °F | 1.15 in. |
| March | 20.0 °F | 41.9 °F | 1.32 in. |
| April | 26.5 °F | 49.7 °F | 2.15 in. |
| May | 33.1 °F | 58.6 °F | 3.27 in. |
| June | 41.2 °F | 67.0 °F | 3.2 in. |
| July | 47.5 °F | 78.4 °F | 1.3 in. |
| August | 46.2 °F | 77.8 °F | 1.22 in. |
| September | 36.7 °F | 66.8 °F | 1.62 in. |
| October | 30.1 °F | 51.4 °F | 1.57 in. |
| November | 18.8 °F | 37.6 °F | 1.34 in. |
| December | 13.8 °F | 30.6 °F | 1.7 in. |
| Annual | 28.4 °F | 52.1 °F | 20.99 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |