Papineau, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 61 °F (high). Annual precipitation averages 38.8 Inches. Papineau is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 32.2 °F | 2.21 in. |
| February | 19.3 °F | 36.8 °F | 1.95 in. |
| March | 28.8 °F | 48.5 °F | 2.37 in. |
| April | 38.9 °F | 61.8 °F | 3.64 in. |
| May | 50.4 °F | 72.7 °F | 4.37 in. |
| June | 60.2 °F | 81.7 °F | 4.85 in. |
| July | 63.4 °F | 84.5 °F | 4.39 in. |
| August | 61.1 °F | 82.9 °F | 3.68 in. |
| September | 53.2 °F | 78.0 °F | 3.22 in. |
| October | 41.9 °F | 65.1 °F | 3.38 in. |
| November | 31.4 °F | 49.9 °F | 2.59 in. |
| December | 22.0 °F | 37.4 °F | 2.19 in. |
| Annual | 40.6 °F | 61 °F | 38.84 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 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 |