Louisville, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 18.7 °C (high). Annual precipitation averages 1157.2 Millimeters. Louisville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 3.7 °C | 81.53 mm |
| February | -3.6 °C | 6.3 °C | 63.75 mm |
| March | 1.3 °C | 12.3 °C | 93.22 mm |
| April | 7 °C | 19.3 °C | 123.44 mm |
| May | 12.9 °C | 24.6 °C | 128.02 mm |
| June | 17.7 °C | 29.4 °C | 121.92 mm |
| July | 19.2 °C | 31 °C | 105.41 mm |
| August | 17.9 °C | 30.4 °C | 90.68 mm |
| September | 13.6 °C | 27.3 °C | 83.57 mm |
| October | 7.4 °C | 20.8 °C | 85.6 mm |
| November | 1.7 °C | 12.6 °C | 102.36 mm |
| December | -2.7 °C | 6.1 °C | 77.72 mm |
| Annual | 7.3 °C | 18.7 °C | 1157.22 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |