Pocahontas, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 18.3 °C (high). Annual precipitation averages 1110.5 Millimeters. Pocahontas 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 | -5.8 °C | 3.2 °C | 70.1 mm |
| February | -3.8 °C | 6.1 °C | 60.45 mm |
| March | 1.1 °C | 12 °C | 84.07 mm |
| April | 6.8 °C | 18.8 °C | 123.44 mm |
| May | 12.9 °C | 24.1 °C | 127.51 mm |
| June | 17.8 °C | 29 °C | 118.62 mm |
| July | 19.6 °C | 30.7 °C | 106.17 mm |
| August | 18.3 °C | 30.2 °C | 89.92 mm |
| September | 13.7 °C | 26.8 °C | 83.57 mm |
| October | 7.2 °C | 20.2 °C | 83.82 mm |
| November | 1.6 °C | 12.1 °C | 92.71 mm |
| December | -3.1 °C | 5.8 °C | 70.1 mm |
| Annual | 7.2 °C | 18.3 °C | 1110.48 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |