Bozeman, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.2 °F (low) to 56.9 °F (high). Annual precipitation averages 18.5 Inches. 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 | 14.7 °F | 34.8 °F | 0.81 in. |
| February | 16.4 °F | 37.5 °F | 0.79 in. |
| March | 23.0 °F | 46.4 °F | 1.25 in. |
| April | 29.8 °F | 54.5 °F | 2.24 in. |
| May | 37.7 °F | 63.6 °F | 2.72 in. |
| June | 44.4 °F | 72.2 °F | 3.02 in. |
| July | 50.2 °F | 83.1 °F | 1.3 in. |
| August | 48.4 °F | 82.7 °F | 1.23 in. |
| September | 41.4 °F | 72.3 °F | 1.36 in. |
| October | 31.8 °F | 57.8 °F | 1.7 in. |
| November | 22.1 °F | 43.3 °F | 1.13 in. |
| December | 14.4 °F | 34.3 °F | 0.95 in. |
| Annual | 31.2 °F | 56.9 °F | 18.5 in. |
| 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 : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |