Alberton, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.3 °F (low) to 58.9 °F (high). Annual precipitation averages 18.1 Inches. 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 | 19.5 °F | 34.7 °F | 1.47 in. |
| February | 20.9 °F | 39.3 °F | 1.45 in. |
| March | 26.1 °F | 49.0 °F | 1.5 in. |
| April | 31.8 °F | 58.3 °F | 1.79 in. |
| May | 38.8 °F | 68.3 °F | 1.93 in. |
| June | 45.3 °F | 75.2 °F | 2.23 in. |
| July | 50.0 °F | 86.6 °F | 0.74 in. |
| August | 48.5 °F | 86.1 °F | 0.84 in. |
| September | 40.8 °F | 75.0 °F | 1.15 in. |
| October | 32.8 °F | 58.5 °F | 1.58 in. |
| November | 25.5 °F | 42.3 °F | 1.95 in. |
| December | 19.8 °F | 33.6 °F | 1.47 in. |
| Annual | 33.3 °F | 58.9 °F | 18.1 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |