Star City, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.7 °C (high). Annual precipitation averages 1035.8 Millimeters. Star City is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.5 °C | 0.1 °C | 65.28 mm |
| February | -7 °C | 2.4 °C | 56.39 mm |
| March | -2.1 °C | 8.8 °C | 66.29 mm |
| April | 3.6 °C | 15.8 °C | 95.5 mm |
| May | 9.9 °C | 21.9 °C | 107.19 mm |
| June | 15.4 °C | 27.1 °C | 116.59 mm |
| July | 17 °C | 28.7 °C | 119.13 mm |
| August | 15.9 °C | 27.8 °C | 105.92 mm |
| September | 11.6 °C | 24.8 °C | 87.12 mm |
| October | 5.4 °C | 17.8 °C | 82.3 mm |
| November | -0.2 °C | 9.6 °C | 74.17 mm |
| December | -5.2 °C | 3 °C | 59.94 mm |
| Annual | 4.7 °C | 15.7 °C | 1035.82 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |