Mount Clare, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 17.7 °C (high). Annual precipitation averages 1071.4 Millimeters. 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 | -6.2 °C | 2.5 °C | 64.26 mm |
| February | -4.3 °C | 5.5 °C | 57.15 mm |
| March | 0.7 °C | 11.6 °C | 79.25 mm |
| April | 6.4 °C | 18.2 °C | 121.16 mm |
| May | 12.6 °C | 23.6 °C | 127.76 mm |
| June | 17.6 °C | 28.4 °C | 110.24 mm |
| July | 19.3 °C | 30.2 °C | 101.09 mm |
| August | 18.1 °C | 29.6 °C | 88.14 mm |
| September | 13.4 °C | 26.4 °C | 84.84 mm |
| October | 7.1 °C | 19.8 °C | 82.3 mm |
| November | 1.4 °C | 11.7 °C | 88.9 mm |
| December | -3.5 °C | 5.2 °C | 66.29 mm |
| Annual | 6.9 °C | 17.7 °C | 1071.38 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |