Bridgeport, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45 °F (low) to 65.5 °F (high). Annual precipitation averages 48 Inches. Bridgeport is located in USDA Plant Hardiness Zone 6b. 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 | 22.5 °F | 38.6 °F | 3.47 in. |
| February | 25.6 °F | 43.7 °F | 2.71 in. |
| March | 33.8 °F | 54.1 °F | 3.83 in. |
| April | 44.2 °F | 66.3 °F | 5.09 in. |
| May | 55.3 °F | 76.2 °F | 5.3 in. |
| June | 64.0 °F | 84.8 °F | 5.04 in. |
| July | 66.6 °F | 87.4 °F | 4.49 in. |
| August | 64.4 °F | 86.5 °F | 3.16 in. |
| September | 56.6 °F | 81.2 °F | 3.54 in. |
| October | 44.9 °F | 69.1 °F | 3.78 in. |
| November | 34.8 °F | 54.8 °F | 4.05 in. |
| December | 26.8 °F | 43.0 °F | 3.49 in. |
| Annual | 45 °F | 65.5 °F | 47.95 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |