Fort Branch, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 46.2 °F (low) to 66.6 °F (high). Annual precipitation averages 48.5 Inches. Fort Branch is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.0 °F | 40.4 °F | 3.57 in. |
| February | 26.7 °F | 45.6 °F | 3.04 in. |
| March | 35.0 °F | 55.6 °F | 4.36 in. |
| April | 45.5 °F | 67.6 °F | 5.18 in. |
| May | 56.0 °F | 77.0 °F | 5.37 in. |
| June | 64.7 °F | 85.3 °F | 4.58 in. |
| July | 67.8 °F | 88.3 °F | 4.36 in. |
| August | 65.9 °F | 87.4 °F | 3.13 in. |
| September | 58.3 °F | 81.8 °F | 3.61 in. |
| October | 46.5 °F | 70.0 °F | 3.46 in. |
| November | 35.9 °F | 55.8 °F | 4.04 in. |
| December | 27.9 °F | 44.7 °F | 3.84 in. |
| Annual | 46.2 °F | 66.6 °F | 48.54 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |