Claremont, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 18.4 °C (high). Annual precipitation averages 1190.5 Millimeters. Claremont 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.5 °C | 3.6 °C | 86.87 mm |
| February | -3.8 °C | 6.3 °C | 65.53 mm |
| March | 0.9 °C | 12.1 °C | 99.82 mm |
| April | 6.7 °C | 18.8 °C | 126.49 mm |
| May | 12.7 °C | 24.3 °C | 132.84 mm |
| June | 17.7 °C | 29 °C | 124.46 mm |
| July | 19.2 °C | 30.8 °C | 114.55 mm |
| August | 18 °C | 30.2 °C | 74.17 mm |
| September | 13.6 °C | 27.2 °C | 85.34 mm |
| October | 7.3 °C | 20.6 °C | 92.46 mm |
| November | 1.4 °C | 12.4 °C | 101.85 mm |
| December | -3.1 °C | 6 °C | 86.11 mm |
| Annual | 7.1 °C | 18.4 °C | 1190.49 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 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 |