Biddle, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 60.5 °F (high). Annual precipitation averages 14.5 Inches. Biddle 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. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.5 °F | 35.1 °F | 0.4 in. |
| February | 13.9 °F | 38.4 °F | 0.41 in. |
| March | 22.2 °F | 48.9 °F | 0.72 in. |
| April | 31.1 °F | 58.6 °F | 1.62 in. |
| May | 40.4 °F | 67.6 °F | 2.7 in. |
| June | 49.7 °F | 78.7 °F | 2.39 in. |
| July | 56.3 °F | 88.5 °F | 2.0 in. |
| August | 54.2 °F | 87.9 °F | 1.1 in. |
| September | 44.1 °F | 77.4 °F | 1.12 in. |
| October | 32.2 °F | 61.5 °F | 1.32 in. |
| November | 20.8 °F | 46.7 °F | 0.36 in. |
| December | 12.1 °F | 36.3 °F | 0.33 in. |
| Annual | 32.3 °F | 60.5 °F | 14.47 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 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |