Sunburst, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 30.5 °F (low) to 55.4 °F (high). Annual precipitation averages 13.9 Inches. Sunburst is located in USDA Plant Hardiness Zone 4a. 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 | 10.0 °F | 31.2 °F | 0.48 in. |
| February | 12.4 °F | 34.3 °F | 0.42 in. |
| March | 20.3 °F | 43.2 °F | 0.68 in. |
| April | 29.6 °F | 54.8 °F | 1.28 in. |
| May | 38.7 °F | 64.6 °F | 1.94 in. |
| June | 46.9 °F | 72.0 °F | 3.45 in. |
| July | 51.8 °F | 81.5 °F | 1.2 in. |
| August | 50.4 °F | 81.2 °F | 1.28 in. |
| September | 42.4 °F | 70.6 °F | 1.28 in. |
| October | 31.3 °F | 56.9 °F | 0.9 in. |
| November | 20.4 °F | 42.3 °F | 0.56 in. |
| December | 11.6 °F | 32.5 °F | 0.45 in. |
| Annual | 30.5 °F | 55.4 °F | 13.92 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°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 |