Clayton, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 61.6 °F (high). Annual precipitation averages 44.7 Inches. Clayton is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.5 °F | 35.2 °F | 3.06 in. |
| February | 22.3 °F | 39.3 °F | 2.6 in. |
| March | 31.3 °F | 50.3 °F | 3.39 in. |
| April | 42.0 °F | 62.3 °F | 4.73 in. |
| May | 52.9 °F | 72.2 °F | 4.82 in. |
| June | 61.6 °F | 80.7 °F | 5.21 in. |
| July | 64.8 °F | 83.8 °F | 4.51 in. |
| August | 63.1 °F | 82.8 °F | 3.17 in. |
| September | 55.5 °F | 77.4 °F | 3.51 in. |
| October | 44.2 °F | 65.0 °F | 3.46 in. |
| November | 33.4 °F | 51.1 °F | 3.27 in. |
| December | 24.7 °F | 39.5 °F | 2.96 in. |
| Annual | 42.9 °F | 61.6 °F | 44.69 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |