Lake Catherine, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.4 °C (low) to 14 °C (high). Annual precipitation averages 956.3 Millimeters. Lake Catherine is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -10.5 °C | -1.7 °C | 48.01 mm |
| February | -8.8 °C | 0.3 °C | 47.5 mm |
| March | -3.6 °C | 6.3 °C | 57.15 mm |
| April | 2.1 °C | 13.7 °C | 98.55 mm |
| May | 8.1 °C | 20.1 °C | 112.27 mm |
| June | 13.8 °C | 25.6 °C | 118.87 mm |
| July | 16.4 °C | 27.9 °C | 93.98 mm |
| August | 15.6 °C | 27.1 °C | 93.22 mm |
| September | 11.3 °C | 23.3 °C | 92.96 mm |
| October | 4.8 °C | 16 °C | 78.99 mm |
| November | -1.1 °C | 8 °C | 61.21 mm |
| December | -6.9 °C | 1.2 °C | 53.59 mm |
| Annual | 3.4 °C | 14 °C | 956.3 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |