Oneida, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.4 °F (low) to 59.7 °F (high). Annual precipitation averages 38.7 Inches. Oneida is located in USDA Plant Hardiness Zone 5b. 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 | 13.7 °F | 30.2 °F | 1.73 in. |
| February | 16.8 °F | 34.8 °F | 1.95 in. |
| March | 27.4 °F | 47.9 °F | 2.42 in. |
| April | 38.0 °F | 61.1 °F | 3.88 in. |
| May | 50.3 °F | 71.8 °F | 5.2 in. |
| June | 60.1 °F | 80.6 °F | 4.72 in. |
| July | 63.2 °F | 83.6 °F | 3.91 in. |
| August | 61.0 °F | 82.1 °F | 3.69 in. |
| September | 52.7 °F | 76.3 °F | 3.81 in. |
| October | 41.1 °F | 63.7 °F | 2.89 in. |
| November | 29.5 °F | 48.5 °F | 2.45 in. |
| December | 19.5 °F | 35.7 °F | 2.09 in. |
| Annual | 39.4 °F | 59.7 °F | 38.74 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |