Oakdale, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.5 °F (low) to 65.7 °F (high). Annual precipitation averages 44.6 Inches. Oakdale is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.6 °F | 39.5 °F | 2.83 in. |
| February | 25.9 °F | 44.5 °F | 2.56 in. |
| March | 34.4 °F | 54.9 °F | 3.66 in. |
| April | 44.9 °F | 66.7 °F | 4.91 in. |
| May | 55.6 °F | 75.8 °F | 5.17 in. |
| June | 64.2 °F | 84.7 °F | 4.76 in. |
| July | 67.7 °F | 87.7 °F | 4.14 in. |
| August | 65.4 °F | 86.7 °F | 3.16 in. |
| September | 57.1 °F | 80.5 °F | 3.31 in. |
| October | 45.8 °F | 69.3 °F | 3.27 in. |
| November | 35.4 °F | 54.9 °F | 3.89 in. |
| December | 27.2 °F | 43.6 °F | 2.98 in. |
| Annual | 45.5 °F | 65.7 °F | 44.64 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |