Lima, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 62.6 °F (high). Annual precipitation averages 40.3 Inches. Lima 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.9 °F | 34.5 °F | 1.75 in. |
| February | 21.3 °F | 39.2 °F | 1.93 in. |
| March | 31.2 °F | 51.2 °F | 2.54 in. |
| April | 42.1 °F | 63.5 °F | 4.05 in. |
| May | 53.4 °F | 73.5 °F | 5.36 in. |
| June | 63.1 °F | 82.6 °F | 4.96 in. |
| July | 66.6 °F | 86.4 °F | 4.08 in. |
| August | 64.4 °F | 84.8 °F | 3.93 in. |
| September | 56.0 °F | 78.5 °F | 3.66 in. |
| October | 44.4 °F | 66.0 °F | 3.32 in. |
| November | 33.0 °F | 51.7 °F | 2.68 in. |
| December | 23.2 °F | 39.2 °F | 1.99 in. |
| Annual | 43.1 °F | 62.6 °F | 40.25 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |