Bozeman, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.5 °C (low) to 13.8 °C (high). Annual precipitation averages 469.9 Millimeters. Bozeman 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 1.6 °C | 20.57 mm |
| February | -8.7 °C | 3.1 °C | 20.07 mm |
| March | -5 °C | 8 °C | 31.75 mm |
| April | -1.2 °C | 12.5 °C | 56.9 mm |
| May | 3.2 °C | 17.6 °C | 69.09 mm |
| June | 6.9 °C | 22.3 °C | 76.71 mm |
| July | 10.1 °C | 28.4 °C | 33.02 mm |
| August | 9.1 °C | 28.2 °C | 31.24 mm |
| September | 5.2 °C | 22.4 °C | 34.54 mm |
| October | -0.1 °C | 14.3 °C | 43.18 mm |
| November | -5.5 °C | 6.3 °C | 28.7 mm |
| December | -9.8 °C | 1.3 °C | 24.13 mm |
| Annual | -0.5 °C | 13.8 °C | 469.9 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |