Loma, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.9 °C (low) to 15.3 °C (high). Annual precipitation averages 325.4 Millimeters. Loma is located in USDA Plant Hardiness Zone 3b. 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 | -13.6 °C | 0.9 °C | 12.7 mm |
| February | -11.8 °C | 3.5 °C | 10.16 mm |
| March | -6.8 °C | 8.7 °C | 12.19 mm |
| April | -0.8 °C | 15.2 °C | 35.31 mm |
| May | 4.4 °C | 20.1 °C | 49.53 mm |
| June | 9.1 °C | 24.7 °C | 66.55 mm |
| July | 11.9 °C | 30.6 °C | 29.21 mm |
| August | 10.8 °C | 30.2 °C | 29.97 mm |
| September | 5.4 °C | 24.2 °C | 28.45 mm |
| October | -0.9 °C | 16.1 °C | 26.42 mm |
| November | -6.8 °C | 7.7 °C | 14.73 mm |
| December | -11.8 °C | 2.1 °C | 10.16 mm |
| Annual | -0.9 °C | 15.3 °C | 325.38 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 3b : -37.2°C to -34.4°C |
| Plant Hardiness Zone - 2012 | Zone 3b : -37.2°C to -34.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |