Flaxville, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.1 °C (low) to 11 °C (high). Annual precipitation averages 375.2 Millimeters. Flaxville is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.4 °C | -5.8 °C | 12.19 mm |
| February | -13.7 °C | -3.8 °C | 9.14 mm |
| March | -8.1 °C | 2.9 °C | 16.51 mm |
| April | -1.3 °C | 11.4 °C | 25.91 mm |
| May | 4.4 °C | 17.9 °C | 52.58 mm |
| June | 9.6 °C | 22.8 °C | 82.3 mm |
| July | 12.7 °C | 27.1 °C | 60.96 mm |
| August | 11.9 °C | 27.3 °C | 37.08 mm |
| September | 6.9 °C | 21.4 °C | 28.19 mm |
| October | 0.1 °C | 12.4 °C | 22.1 mm |
| November | -7.4 °C | 2.7 °C | 14.48 mm |
| December | -13.2 °C | -3.9 °C | 13.72 mm |
| Annual | -1.1 °C | 11 °C | 375.16 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |