Payson, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.3 °F (low) to 62.8 °F (high). Annual precipitation averages 39.2 Inches. Payson is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.4 °F | 34.9 °F | 1.96 in. |
| February | 22.0 °F | 39.9 °F | 2.06 in. |
| March | 31.6 °F | 51.5 °F | 2.57 in. |
| April | 42.5 °F | 63.8 °F | 3.96 in. |
| May | 53.7 °F | 73.6 °F | 5.08 in. |
| June | 63.2 °F | 82.5 °F | 4.5 in. |
| July | 66.4 °F | 86.2 °F | 4.11 in. |
| August | 64.3 °F | 84.8 °F | 3.67 in. |
| September | 55.7 °F | 78.6 °F | 3.45 in. |
| October | 44.2 °F | 66.1 °F | 3.12 in. |
| November | 33.4 °F | 52.1 °F | 2.65 in. |
| December | 23.8 °F | 39.6 °F | 2.08 in. |
| Annual | 43.3 °F | 62.8 °F | 39.21 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |