Cameron, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.9 °C (high). Annual precipitation averages 979.2 Millimeters. Cameron 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 | -9.7 °C | -0.4 °C | 44.45 mm |
| February | -7.8 °C | 2.1 °C | 47.5 mm |
| March | -1.9 °C | 9.3 °C | 63.25 mm |
| April | 3.9 °C | 16.6 °C | 97.03 mm |
| May | 10.7 °C | 22.6 °C | 128.27 mm |
| June | 16.1 °C | 27.4 °C | 120.14 mm |
| July | 17.8 °C | 29.2 °C | 101.85 mm |
| August | 16.6 °C | 28.3 °C | 93.73 mm |
| September | 12 °C | 25 °C | 97.28 mm |
| October | 5.5 °C | 18.1 °C | 72.9 mm |
| November | -0.9 °C | 9.6 °C | 62.48 mm |
| December | -6.4 °C | 2.5 °C | 50.29 mm |
| Annual | 4.7 °C | 15.9 °C | 979.17 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |