Sandoval, 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 18.5 °C (high). Annual precipitation averages 1138.7 Millimeters. Sandoval 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 | -5.4 °C | 3.7 °C | 76.96 mm |
| February | -3.7 °C | 6.3 °C | 64.77 mm |
| March | 1.2 °C | 12.2 °C | 92.96 mm |
| April | 6.9 °C | 18.9 °C | 121.92 mm |
| May | 12.9 °C | 24.2 °C | 127.51 mm |
| June | 17.8 °C | 29.2 °C | 122.94 mm |
| July | 19.6 °C | 30.8 °C | 102.62 mm |
| August | 18.3 °C | 30.3 °C | 83.82 mm |
| September | 13.7 °C | 26.9 °C | 86.61 mm |
| October | 7.3 °C | 20.4 °C | 86.61 mm |
| November | 1.7 °C | 12.4 °C | 96.77 mm |
| December | -2.9 °C | 6.1 °C | 75.18 mm |
| Annual | 7.3 °C | 18.5 °C | 1138.67 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 |