Mount Clare, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.4 °F (low) to 63.9 °F (high). Annual precipitation averages 42.2 Inches. Mount Clare is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.8 °F | 36.5 °F | 2.53 in. |
| February | 24.2 °F | 41.9 °F | 2.25 in. |
| March | 33.2 °F | 52.8 °F | 3.12 in. |
| April | 43.6 °F | 64.8 °F | 4.77 in. |
| May | 54.6 °F | 74.5 °F | 5.03 in. |
| June | 63.6 °F | 83.2 °F | 4.34 in. |
| July | 66.8 °F | 86.3 °F | 3.98 in. |
| August | 64.6 °F | 85.3 °F | 3.47 in. |
| September | 56.1 °F | 79.6 °F | 3.34 in. |
| October | 44.8 °F | 67.6 °F | 3.24 in. |
| November | 34.6 °F | 53.1 °F | 3.5 in. |
| December | 25.7 °F | 41.4 °F | 2.61 in. |
| Annual | 44.4 °F | 63.9 °F | 42.18 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |