Franklin Park, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 59.3 °F (high). Annual precipitation averages 38.6 Inches. Franklin Park is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 17.2 °F | 31.6 °F | 2.13 in. |
| February | 19.9 °F | 35.4 °F | 2.08 in. |
| March | 29.0 °F | 46.1 °F | 2.31 in. |
| April | 39.3 °F | 58.4 °F | 3.92 in. |
| May | 50.2 °F | 69.7 °F | 4.65 in. |
| June | 60.4 °F | 79.8 °F | 4.39 in. |
| July | 65.7 °F | 84.2 °F | 3.69 in. |
| August | 64.3 °F | 82.3 °F | 3.98 in. |
| September | 56.3 °F | 75.7 °F | 3.3 in. |
| October | 44.2 °F | 62.7 °F | 3.38 in. |
| November | 32.9 °F | 48.7 °F | 2.55 in. |
| December | 23.0 °F | 37.0 °F | 2.26 in. |
| Annual | 41.9 °F | 59.3 °F | 38.64 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |