Lima, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.2 °C (low) to 17 °C (high). Annual precipitation averages 1022.3 Millimeters. 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 | -7.8 °C | 1.4 °C | 44.45 mm |
| February | -5.9 °C | 4 °C | 49.02 mm |
| March | -0.4 °C | 10.7 °C | 64.52 mm |
| April | 5.6 °C | 17.5 °C | 102.87 mm |
| May | 11.9 °C | 23.1 °C | 136.14 mm |
| June | 17.3 °C | 28.1 °C | 125.98 mm |
| July | 19.2 °C | 30.2 °C | 103.63 mm |
| August | 18 °C | 29.3 °C | 99.82 mm |
| September | 13.3 °C | 25.8 °C | 92.96 mm |
| October | 6.9 °C | 18.9 °C | 84.33 mm |
| November | 0.6 °C | 10.9 °C | 68.07 mm |
| December | -4.9 °C | 4 °C | 50.55 mm |
| Annual | 6.2 °C | 17 °C | 1022.34 mm |
| 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 : -23.3°C to -20.6°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 |