Biddle, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.2 °C (low) to 15.8 °C (high). Annual precipitation averages 367.5 Millimeters. 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 | -11.9 °C | 1.7 °C | 10.16 mm |
| February | -10.1 °C | 3.6 °C | 10.41 mm |
| March | -5.4 °C | 9.4 °C | 18.29 mm |
| April | -0.5 °C | 14.8 °C | 41.15 mm |
| May | 4.7 °C | 19.8 °C | 68.58 mm |
| June | 9.8 °C | 25.9 °C | 60.71 mm |
| July | 13.5 °C | 31.4 °C | 50.8 mm |
| August | 12.3 °C | 31.1 °C | 27.94 mm |
| September | 6.7 °C | 25.2 °C | 28.45 mm |
| October | 0.1 °C | 16.4 °C | 33.53 mm |
| November | -6.2 °C | 8.2 °C | 9.14 mm |
| December | -11.1 °C | 2.4 °C | 8.38 mm |
| Annual | 0.2 °C | 15.8 °C | 367.54 mm |
| 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 : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |