Baldwin, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.8 °C (low) to 19.2 °C (high). Annual precipitation averages 1118.1 Millimeters. Baldwin is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 4.7 °C | 69.09 mm |
| February | -3.1 °C | 7.6 °C | 63.75 mm |
| March | 1.6 °C | 13.3 °C | 91.44 mm |
| April | 7.3 °C | 19.7 °C | 124.97 mm |
| May | 13.3 °C | 24.8 °C | 132.33 mm |
| June | 18.2 °C | 29.7 °C | 114.3 mm |
| July | 20.3 °C | 31.4 °C | 104.14 mm |
| August | 19.1 °C | 30.9 °C | 81.03 mm |
| September | 14.3 °C | 27.3 °C | 82.04 mm |
| October | 7.9 °C | 21.1 °C | 78.74 mm |
| November | 2.1 °C | 13.2 °C | 99.31 mm |
| December | -2.8 °C | 6.9 °C | 76.96 mm |
| Annual | 7.8 °C | 19.2 °C | 1118.1 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |