Stevensville, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 59.7 °F (high). Annual precipitation averages 12.3 Inches. Stevensville is located in USDA Plant Hardiness Zone 5b. 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 | 18.4 °F | 35.8 °F | 0.92 in. |
| February | 20.4 °F | 40.9 °F | 0.83 in. |
| March | 25.7 °F | 50.6 °F | 0.79 in. |
| April | 31.0 °F | 59.0 °F | 0.92 in. |
| May | 37.8 °F | 68.3 °F | 1.48 in. |
| June | 44.4 °F | 75.8 °F | 1.63 in. |
| July | 48.7 °F | 87.5 °F | 0.74 in. |
| August | 47.0 °F | 86.0 °F | 0.81 in. |
| September | 40.0 °F | 75.2 °F | 0.85 in. |
| October | 31.4 °F | 59.6 °F | 1.05 in. |
| November | 23.9 °F | 43.5 °F | 1.15 in. |
| December | 18.3 °F | 34.2 °F | 1.15 in. |
| Annual | 32.3 °F | 59.7 °F | 12.32 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |