Trivoli, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.4 °F (low) to 60.9 °F (high). Annual precipitation averages 38.6 Inches. 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 | 14.9 °F | 31.9 °F | 1.96 in. |
| February | 18.3 °F | 36.6 °F | 1.98 in. |
| March | 28.4 °F | 49.2 °F | 2.51 in. |
| April | 39.2 °F | 62.0 °F | 3.79 in. |
| May | 51.0 °F | 72.6 °F | 4.98 in. |
| June | 60.8 °F | 81.5 °F | 4.63 in. |
| July | 64.0 °F | 84.6 °F | 4.01 in. |
| August | 61.8 °F | 83.1 °F | 3.51 in. |
| September | 53.7 °F | 77.3 °F | 3.62 in. |
| October | 41.8 °F | 64.6 °F | 2.99 in. |
| November | 30.2 °F | 49.7 °F | 2.59 in. |
| December | 20.8 °F | 37.3 °F | 2.06 in. |
| Annual | 40.4 °F | 60.9 °F | 38.63 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |