Sula, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27.6 °F (low) to 55.7 °F (high). Annual precipitation averages 16.3 Inches. Sula is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.7 °F | 32.8 °F | 0.91 in. |
| February | 14.4 °F | 37.7 °F | 0.72 in. |
| March | 21.4 °F | 46.6 °F | 1.02 in. |
| April | 27.1 °F | 53.1 °F | 1.67 in. |
| May | 33.9 °F | 62.6 °F | 2.11 in. |
| June | 39.9 °F | 70.5 °F | 2.58 in. |
| July | 44.1 °F | 82.2 °F | 1.12 in. |
| August | 41.8 °F | 81.7 °F | 1.03 in. |
| September | 35.2 °F | 71.8 °F | 1.16 in. |
| October | 27.8 °F | 56.8 °F | 1.42 in. |
| November | 20.2 °F | 41.0 °F | 1.45 in. |
| December | 12.2 °F | 31.3 °F | 1.08 in. |
| Annual | 27.6 °F | 55.7 °F | 16.27 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |