Toston, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.3 °F (low) to 58.8 °F (high). Annual precipitation averages 12 Inches. Toston 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.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.6 °F | 34.4 °F | 0.37 in. |
| February | 16.3 °F | 38.9 °F | 0.26 in. |
| March | 22.3 °F | 49.0 °F | 0.71 in. |
| April | 29.7 °F | 58.4 °F | 1.13 in. |
| May | 38.1 °F | 67.1 °F | 1.9 in. |
| June | 44.7 °F | 75.1 °F | 2.61 in. |
| July | 49.4 °F | 85.2 °F | 1.18 in. |
| August | 46.5 °F | 84.2 °F | 1.11 in. |
| September | 39.6 °F | 74.2 °F | 0.93 in. |
| October | 30.3 °F | 60.1 °F | 0.82 in. |
| November | 20.9 °F | 44.8 °F | 0.55 in. |
| December | 13.4 °F | 34.7 °F | 0.46 in. |
| Annual | 30.3 °F | 58.8 °F | 12.03 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |