Ashley, Indiana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.6 °F (low) to 59.3 °F (high). Annual precipitation averages 39 Inches. Ashley is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.6 °F | 31.5 °F | 2.44 in. |
| February | 18.3 °F | 35.2 °F | 2.14 in. |
| March | 26.6 °F | 46.3 °F | 2.46 in. |
| April | 37.3 °F | 59.6 °F | 3.6 in. |
| May | 48.9 °F | 70.9 °F | 4.33 in. |
| June | 58.6 °F | 80.0 °F | 4.02 in. |
| July | 61.6 °F | 83.3 °F | 3.85 in. |
| August | 59.7 °F | 81.3 °F | 4.27 in. |
| September | 52.2 °F | 75.5 °F | 3.36 in. |
| October | 41.3 °F | 62.9 °F | 2.99 in. |
| November | 31.3 °F | 48.3 °F | 3.07 in. |
| December | 22.6 °F | 36.4 °F | 2.48 in. |
| Annual | 39.6 °F | 59.3 °F | 39.01 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |