South Browning, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 29.7 °F (low) to 52.2 °F (high). Annual precipitation averages 16.9 Inches. South Browning 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.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.5 °F | 32.2 °F | 0.82 in. |
| February | 13.9 °F | 33.7 °F | 1.02 in. |
| March | 19.9 °F | 40.6 °F | 1.08 in. |
| April | 27.9 °F | 49.5 °F | 1.35 in. |
| May | 35.7 °F | 58.8 °F | 2.3 in. |
| June | 42.7 °F | 66.7 °F | 3.33 in. |
| July | 47.8 °F | 76.9 °F | 1.24 in. |
| August | 46.4 °F | 76.7 °F | 0.98 in. |
| September | 39.6 °F | 66.4 °F | 1.27 in. |
| October | 30.8 °F | 52.5 °F | 1.29 in. |
| November | 23.0 °F | 40.4 °F | 1.21 in. |
| December | 15.3 °F | 32.4 °F | 0.96 in. |
| Annual | 29.7 °F | 52.2 °F | 16.85 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 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |