Rosebud, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1 °C (low) to 15.5 °C (high). Annual precipitation averages 368.6 Millimeters. Rosebud is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.2 °C | 0.3 °C | 11.68 mm |
| February | -10.4 °C | 2.8 °C | 11.94 mm |
| March | -4.9 °C | 9.2 °C | 19.05 mm |
| April | 0.7 °C | 15 °C | 41.91 mm |
| May | 6.2 °C | 20.3 °C | 65.02 mm |
| June | 11.4 °C | 25.8 °C | 62.74 mm |
| July | 14.8 °C | 31.3 °C | 37.85 mm |
| August | 13.4 °C | 30.6 °C | 26.67 mm |
| September | 7.8 °C | 24.8 °C | 34.8 mm |
| October | 1.2 °C | 15.7 °C | 31.24 mm |
| November | -5.6 °C | 8 °C | 13.97 mm |
| December | -10.9 °C | 1.6 °C | 11.68 mm |
| Annual | 1 °C | 15.5 °C | 368.55 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°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 |