Polebridge, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 26.8 °F (low) to 54 °F (high). Annual precipitation averages 19.7 Inches. Polebridge is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.4 °F | 30.9 °F | 1.96 in. |
| February | 13.1 °F | 35.6 °F | 1.52 in. |
| March | 19.5 °F | 43.5 °F | 1.42 in. |
| April | 26.0 °F | 53.0 °F | 1.31 in. |
| May | 33.4 °F | 63.0 °F | 1.65 in. |
| June | 39.5 °F | 69.5 °F | 2.7 in. |
| July | 42.7 °F | 80.0 °F | 1.13 in. |
| August | 40.4 °F | 80.2 °F | 0.83 in. |
| September | 33.4 °F | 69.4 °F | 1.01 in. |
| October | 26.2 °F | 53.7 °F | 1.67 in. |
| November | 20.5 °F | 39.1 °F | 2.25 in. |
| December | 15.0 °F | 30.1 °F | 2.23 in. |
| Annual | 26.8 °F | 54 °F | 19.68 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |