Dixon, Iowa has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.4 °C (low) to 15.3 °C (high). Annual precipitation averages 973.9 Millimeters. Dixon 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 | -10.4 °C | -1.3 °C | 34.8 mm |
| February | -8.4 °C | 1.2 °C | 41.66 mm |
| March | -2.3 °C | 8.4 °C | 62.23 mm |
| April | 3.8 °C | 16 °C | 97.03 mm |
| May | 10.4 °C | 22.2 °C | 120.65 mm |
| June | 16.1 °C | 27.3 °C | 125.73 mm |
| July | 17.9 °C | 28.9 °C | 108.97 mm |
| August | 16.7 °C | 28 °C | 108.97 mm |
| September | 12.1 °C | 24.8 °C | 95 mm |
| October | 5.5 °C | 17.6 °C | 75.69 mm |
| November | -1.2 °C | 9.1 °C | 56.39 mm |
| December | -6.9 °C | 1.8 °C | 46.74 mm |
| Annual | 4.4 °C | 15.3 °C | 973.86 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 |