Silver Star, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1 °C (low) to 14.7 °C (high). Annual precipitation averages 266.5 Millimeters. Silver Star is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 2.3 °C | 7.87 mm |
| February | -8.7 °C | 4.1 °C | 7.37 mm |
| March | -5.2 °C | 8.8 °C | 12.19 mm |
| April | -1.7 °C | 13.6 °C | 24.64 mm |
| May | 2.8 °C | 18.6 °C | 46.74 mm |
| June | 6.5 °C | 23.3 °C | 55.37 mm |
| July | 9.2 °C | 29.6 °C | 26.42 mm |
| August | 8.1 °C | 28.9 °C | 21.59 mm |
| September | 4 °C | 23.3 °C | 22.86 mm |
| October | -1.1 °C | 15.4 °C | 20.07 mm |
| November | -6.1 °C | 7 °C | 11.94 mm |
| December | -10 °C | 1.7 °C | 9.4 mm |
| Annual | -1 °C | 14.7 °C | 266.46 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |