Redkey, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.1 °C (low) to 16.1 °C (high). Annual precipitation averages 1047 Millimeters. Redkey 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 | -7.8 °C | 1 °C | 69.6 mm |
| February | -6.4 °C | 3.2 °C | 58.17 mm |
| March | -1.6 °C | 9.1 °C | 80.52 mm |
| April | 4.2 °C | 16.3 °C | 102.87 mm |
| May | 10.5 °C | 22.4 °C | 110.49 mm |
| June | 15.8 °C | 27.1 °C | 116.59 mm |
| July | 17.2 °C | 28.8 °C | 108.2 mm |
| August | 15.9 °C | 28 °C | 94.74 mm |
| September | 11.8 °C | 25.1 °C | 81.28 mm |
| October | 5.8 °C | 18.2 °C | 75.44 mm |
| November | 0.2 °C | 10.3 °C | 81.53 mm |
| December | -4.3 °C | 3.8 °C | 67.56 mm |
| Annual | 5.1 °C | 16.1 °C | 1046.99 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 |