Alberton, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.7 °C (low) to 15 °C (high). Annual precipitation averages 459.8 Millimeters. Alberton is located in USDA Plant Hardiness Zone 6a. 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 | -6.9 °C | 1.5 °C | 37.34 mm |
| February | -6.2 °C | 4.1 °C | 36.83 mm |
| March | -3.3 °C | 9.4 °C | 38.1 mm |
| April | -0.1 °C | 14.6 °C | 45.47 mm |
| May | 3.8 °C | 20.2 °C | 49.02 mm |
| June | 7.4 °C | 24 °C | 56.64 mm |
| July | 10 °C | 30.3 °C | 18.8 mm |
| August | 9.2 °C | 30.1 °C | 21.34 mm |
| September | 4.9 °C | 23.9 °C | 29.21 mm |
| October | 0.4 °C | 14.7 °C | 40.13 mm |
| November | -3.6 °C | 5.7 °C | 49.53 mm |
| December | -6.8 °C | 0.9 °C | 37.34 mm |
| Annual | 0.7 °C | 15 °C | 459.75 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |