Sunman, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 62.9 °F (high). Annual precipitation averages 46.8 Inches. Sunman is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.2 °F | 37.6 °F | 3.45 in. |
| February | 23.2 °F | 41.7 °F | 2.83 in. |
| March | 31.8 °F | 51.7 °F | 3.89 in. |
| April | 42.3 °F | 64.2 °F | 4.9 in. |
| May | 52.5 °F | 73.1 °F | 5.43 in. |
| June | 61.2 °F | 80.9 °F | 4.8 in. |
| July | 64.3 °F | 84.0 °F | 4.11 in. |
| August | 62.8 °F | 83.4 °F | 3.54 in. |
| September | 55.1 °F | 77.8 °F | 3.18 in. |
| October | 44.0 °F | 66.1 °F | 3.42 in. |
| November | 33.3 °F | 53.0 °F | 3.34 in. |
| December | 26.0 °F | 41.8 °F | 3.88 in. |
| Annual | 43.1 °F | 62.9 °F | 46.77 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |