Logan, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.8 °C (low) to 14.5 °C (high). Annual precipitation averages 328.7 Millimeters. Logan is located in USDA Plant Hardiness Zone 4b. 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 | -10.8 °C | 1.2 °C | 7.62 mm |
| February | -9.2 °C | 3.2 °C | 9.14 mm |
| March | -5.3 °C | 8.7 °C | 15.75 mm |
| April | -1.3 °C | 13.6 °C | 40.39 mm |
| May | 3.6 °C | 18.8 °C | 57.66 mm |
| June | 7.3 °C | 23.6 °C | 67.82 mm |
| July | 10.2 °C | 29.7 °C | 29.97 mm |
| August | 8.7 °C | 29.2 °C | 24.64 mm |
| September | 4.6 °C | 23.2 °C | 27.69 mm |
| October | -0.9 °C | 15.1 °C | 25.91 mm |
| November | -6.4 °C | 6.7 °C | 13.97 mm |
| December | -10.6 °C | 1.1 °C | 8.13 mm |
| Annual | -0.8 °C | 14.5 °C | 328.69 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |