Dixon, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.9 °C (low) to 14.9 °C (high). Annual precipitation averages 1005.9 Millimeters. Dixon is located in USDA Plant Hardiness Zone 5b. 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 | -10.7 °C | -1.4 °C | 45.72 mm |
| February | -8.6 °C | 1.1 °C | 45.47 mm |
| March | -2.7 °C | 8 °C | 63.25 mm |
| April | 3.1 °C | 15.5 °C | 93.98 mm |
| May | 9.7 °C | 21.7 °C | 124.71 mm |
| June | 15.2 °C | 26.7 °C | 135.13 mm |
| July | 17 °C | 28.2 °C | 113.03 mm |
| August | 15.9 °C | 27.4 °C | 104.65 mm |
| September | 11.2 °C | 24.2 °C | 95 mm |
| October | 4.7 °C | 17.1 °C | 72.9 mm |
| November | -1.4 °C | 8.7 °C | 59.94 mm |
| December | -7.1 °C | 1.6 °C | 52.07 mm |
| Annual | 3.9 °C | 14.9 °C | 1005.85 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |