Florence, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.2 °F (low) to 64.1 °F (high). Annual precipitation averages 39.8 Inches. Florence is located in USDA Plant Hardiness Zone 6a. 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 | 19.1 °F | 36.2 °F | 2.12 in. |
| February | 22.6 °F | 41.3 °F | 1.97 in. |
| March | 31.6 °F | 52.6 °F | 2.82 in. |
| April | 42.1 °F | 65.3 °F | 4.09 in. |
| May | 53.4 °F | 75.0 °F | 4.74 in. |
| June | 62.5 °F | 83.6 °F | 4.89 in. |
| July | 66.2 °F | 87.1 °F | 4.11 in. |
| August | 63.7 °F | 86.1 °F | 3.42 in. |
| September | 55.3 °F | 79.9 °F | 3.45 in. |
| October | 44.0 °F | 67.7 °F | 2.99 in. |
| November | 33.2 °F | 53.3 °F | 2.93 in. |
| December | 24.3 °F | 41.1 °F | 2.22 in. |
| Annual | 43.2 °F | 64.1 °F | 39.75 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 6a : -10°F to -5°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 |