Redkey, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 61 °F (high). Annual precipitation averages 41.2 Inches. 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 | 17.9 °F | 33.8 °F | 2.74 in. |
| February | 20.5 °F | 37.8 °F | 2.29 in. |
| March | 29.1 °F | 48.4 °F | 3.17 in. |
| April | 39.6 °F | 61.4 °F | 4.05 in. |
| May | 50.9 °F | 72.3 °F | 4.35 in. |
| June | 60.5 °F | 80.8 °F | 4.59 in. |
| July | 62.9 °F | 83.9 °F | 4.26 in. |
| August | 60.7 °F | 82.4 °F | 3.73 in. |
| September | 53.3 °F | 77.2 °F | 3.2 in. |
| October | 42.5 °F | 64.8 °F | 2.97 in. |
| November | 32.3 °F | 50.6 °F | 3.21 in. |
| December | 24.2 °F | 38.8 °F | 2.66 in. |
| Annual | 41.2 °F | 61 °F | 41.22 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |