Sunburst, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.8 °C (low) to 13 °C (high). Annual precipitation averages 353.6 Millimeters. 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 | -12.2 °C | -0.4 °C | 12.19 mm |
| February | -10.9 °C | 1.3 °C | 10.67 mm |
| March | -6.5 °C | 6.2 °C | 17.27 mm |
| April | -1.3 °C | 12.7 °C | 32.51 mm |
| May | 3.7 °C | 18.1 °C | 49.28 mm |
| June | 8.3 °C | 22.2 °C | 87.63 mm |
| July | 11 °C | 27.5 °C | 30.48 mm |
| August | 10.2 °C | 27.3 °C | 32.51 mm |
| September | 5.8 °C | 21.4 °C | 32.51 mm |
| October | -0.4 °C | 13.8 °C | 22.86 mm |
| November | -6.4 °C | 5.7 °C | 14.22 mm |
| December | -11.3 °C | 0.3 °C | 11.43 mm |
| Annual | -0.8 °C | 13 °C | 353.56 mm |
| 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 : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |