Park Ridge, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.8 °F (low) to 58.9 °F (high). Annual precipitation averages 38.3 Inches. Park Ridge 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 | 17.1 °F | 31.5 °F | 2.11 in. |
| February | 19.8 °F | 35.3 °F | 2.01 in. |
| March | 29.0 °F | 45.8 °F | 2.28 in. |
| April | 39.1 °F | 57.8 °F | 3.85 in. |
| May | 50.1 °F | 69.2 °F | 4.63 in. |
| June | 60.1 °F | 79.3 °F | 4.4 in. |
| July | 65.6 °F | 83.6 °F | 3.62 in. |
| August | 64.3 °F | 81.8 °F | 3.97 in. |
| September | 56.2 °F | 75.2 °F | 3.35 in. |
| October | 44.3 °F | 62.5 °F | 3.32 in. |
| November | 32.8 °F | 48.3 °F | 2.54 in. |
| December | 23.0 °F | 36.8 °F | 2.23 in. |
| Annual | 41.8 °F | 58.9 °F | 38.31 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 |