Ashmore, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.4 °F (low) to 63.4 °F (high). Annual precipitation averages 42.6 Inches. Ashmore 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 | 19.7 °F | 35.5 °F | 2.75 in. |
| February | 22.7 °F | 40.3 °F | 2.35 in. |
| March | 31.7 °F | 51.6 °F | 3.07 in. |
| April | 42.5 °F | 64.7 °F | 4.78 in. |
| May | 53.8 °F | 74.6 °F | 4.52 in. |
| June | 62.7 °F | 83.0 °F | 4.85 in. |
| July | 65.3 °F | 86.2 °F | 4.22 in. |
| August | 63.2 °F | 85.0 °F | 2.94 in. |
| September | 55.6 °F | 79.6 °F | 3.1 in. |
| October | 44.3 °F | 67.2 °F | 3.59 in. |
| November | 33.7 °F | 52.3 °F | 3.64 in. |
| December | 25.2 °F | 40.2 °F | 2.78 in. |
| Annual | 43.4 °F | 63.4 °F | 42.59 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 |