Virginia City, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -1.6 °C (low) to 12.5 °C (high). Annual precipitation averages 393.4 Millimeters. Virginia City is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.1 °C | 0.9 °C | 17.02 mm |
| February | -9.9 °C | 2.3 °C | 14.22 mm |
| March | -6.2 °C | 6.7 °C | 21.84 mm |
| April | -2.7 °C | 11 °C | 40.64 mm |
| May | 1.7 °C | 16.1 °C | 62.48 mm |
| June | 5.2 °C | 20.8 °C | 70.1 mm |
| July | 8.8 °C | 26.8 °C | 35.56 mm |
| August | 8.1 °C | 26.3 °C | 29.72 mm |
| September | 4.3 °C | 20.9 °C | 29.21 mm |
| October | -0.9 °C | 13.1 °C | 33.53 mm |
| November | -6.5 °C | 5 °C | 19.56 mm |
| December | -10.7 °C | 0.3 °C | 19.56 mm |
| Annual | -1.6 °C | 12.5 °C | 393.44 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |