Bridger, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.5 °F (low) to 60.3 °F (high). Annual precipitation averages 12 Inches. Bridger is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.6 °F | 36.6 °F | 0.42 in. |
| February | 15.3 °F | 39.8 °F | 0.38 in. |
| March | 23.7 °F | 50.9 °F | 0.63 in. |
| April | 31.2 °F | 58.2 °F | 1.51 in. |
| May | 40.4 °F | 67.6 °F | 2.23 in. |
| June | 48.3 °F | 77.2 °F | 1.93 in. |
| July | 54.2 °F | 87.6 °F | 0.84 in. |
| August | 51.6 °F | 86.1 °F | 0.66 in. |
| September | 43.2 °F | 75.4 °F | 1.15 in. |
| October | 32.2 °F | 60.2 °F | 1.27 in. |
| November | 22.5 °F | 46.8 °F | 0.56 in. |
| December | 14.1 °F | 36.6 °F | 0.45 in. |
| Annual | 32.5 °F | 60.3 °F | 12.03 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |