Compton, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 58.2 °F (high). Annual precipitation averages 37.8 Inches. Compton 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 | 12.1 °F | 28.5 °F | 1.61 in. |
| February | 16.0 °F | 33.1 °F | 1.71 in. |
| March | 25.9 °F | 45.5 °F | 2.28 in. |
| April | 36.2 °F | 59.1 °F | 3.54 in. |
| May | 48.1 °F | 70.8 °F | 4.85 in. |
| June | 58.0 °F | 79.7 °F | 5.02 in. |
| July | 61.6 °F | 82.6 °F | 4.09 in. |
| August | 59.3 °F | 80.7 °F | 3.88 in. |
| September | 51.1 °F | 75.2 °F | 3.55 in. |
| October | 39.4 °F | 62.1 °F | 2.89 in. |
| November | 28.7 °F | 46.9 °F | 2.46 in. |
| December | 18.3 °F | 34.0 °F | 1.87 in. |
| Annual | 37.9 °F | 58.2 °F | 37.75 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |