Sun Prairie, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.3 °F (low) to 58.4 °F (high). Annual precipitation averages 13.8 Inches. Sun Prairie 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 | 15.9 °F | 36.5 °F | 0.49 in. |
| February | 16.3 °F | 38.7 °F | 0.48 in. |
| March | 22.9 °F | 47.0 °F | 0.59 in. |
| April | 31.3 °F | 56.0 °F | 1.57 in. |
| May | 40.0 °F | 65.5 °F | 2.18 in. |
| June | 47.6 °F | 73.8 °F | 2.77 in. |
| July | 52.9 °F | 84.9 °F | 1.18 in. |
| August | 51.4 °F | 84.1 °F | 1.21 in. |
| September | 43.6 °F | 73.0 °F | 1.25 in. |
| October | 34.4 °F | 58.7 °F | 0.98 in. |
| November | 25.4 °F | 45.8 °F | 0.61 in. |
| December | 17.7 °F | 37.0 °F | 0.48 in. |
| Annual | 33.3 °F | 58.4 °F | 13.79 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |