Trivoli, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 16 °C (high). Annual precipitation averages 981.2 Millimeters. Trivoli is located in USDA Plant Hardiness Zone 5b. 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 | -9.5 °C | -0.1 °C | 49.78 mm |
| February | -7.6 °C | 2.6 °C | 50.29 mm |
| March | -2 °C | 9.6 °C | 63.75 mm |
| April | 4 °C | 16.7 °C | 96.27 mm |
| May | 10.6 °C | 22.6 °C | 126.49 mm |
| June | 16 °C | 27.5 °C | 117.6 mm |
| July | 17.8 °C | 29.2 °C | 101.85 mm |
| August | 16.6 °C | 28.4 °C | 89.15 mm |
| September | 12.1 °C | 25.2 °C | 91.95 mm |
| October | 5.4 °C | 18.1 °C | 75.95 mm |
| November | -1 °C | 9.8 °C | 65.79 mm |
| December | -6.2 °C | 2.9 °C | 52.32 mm |
| Annual | 4.7 °C | 16 °C | 981.19 mm |
| 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 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |