Malta, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1 °C (low) to 13.7 °C (high). Annual precipitation averages 331 Millimeters. Malta is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.6 °C | -3.1 °C | 10.16 mm |
| February | -13.6 °C | -0.4 °C | 8.64 mm |
| March | -7.2 °C | 6.8 °C | 11.68 mm |
| April | -0.7 °C | 14.4 °C | 29.21 mm |
| May | 4.9 °C | 19.9 °C | 52.58 mm |
| June | 10 °C | 24.6 °C | 69.85 mm |
| July | 13.2 °C | 29.9 °C | 41.4 mm |
| August | 11.9 °C | 29.6 °C | 29.97 mm |
| September | 6.3 °C | 23.2 °C | 30.23 mm |
| October | -0.4 °C | 14.7 °C | 24.89 mm |
| November | -7.5 °C | 5.9 °C | 12.45 mm |
| December | -13.4 °C | -1.1 °C | 9.91 mm |
| Annual | -1 °C | 13.7 °C | 330.97 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°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 |