LaPlace, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.7 °F (low) to 62.7 °F (high). Annual precipitation averages 39.9 Inches. LaPlace 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 | 18.8 °F | 34.7 °F | 2.31 in. |
| February | 21.6 °F | 39.4 °F | 2.04 in. |
| March | 30.8 °F | 50.7 °F | 2.75 in. |
| April | 41.8 °F | 63.8 °F | 4.36 in. |
| May | 53.3 °F | 74.1 °F | 4.61 in. |
| June | 62.2 °F | 82.8 °F | 4.68 in. |
| July | 65.1 °F | 85.6 °F | 3.87 in. |
| August | 63.0 °F | 84.1 °F | 3.04 in. |
| September | 55.3 °F | 79.3 °F | 3.13 in. |
| October | 43.4 °F | 66.6 °F | 3.37 in. |
| November | 32.8 °F | 51.6 °F | 3.23 in. |
| December | 24.6 °F | 39.7 °F | 2.46 in. |
| Annual | 42.7 °F | 62.7 °F | 39.85 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 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |