Pierron, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.2 °F (low) to 65.1 °F (high). Annual precipitation averages 43.9 Inches. Pierron 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 | 22.0 °F | 38.3 °F | 2.72 in. |
| February | 25.4 °F | 43.6 °F | 2.38 in. |
| March | 34.3 °F | 54.1 °F | 3.36 in. |
| April | 44.7 °F | 66.2 °F | 4.91 in. |
| May | 55.6 °F | 75.5 °F | 5.03 in. |
| June | 64.4 °F | 84.5 °F | 4.74 in. |
| July | 67.9 °F | 87.6 °F | 4.31 in. |
| August | 65.7 °F | 86.7 °F | 3.67 in. |
| September | 57.3 °F | 80.4 °F | 3.32 in. |
| October | 45.6 °F | 68.6 °F | 3.36 in. |
| November | 35.2 °F | 54.2 °F | 3.72 in. |
| December | 26.7 °F | 42.9 °F | 2.82 in. |
| Annual | 45.4 °F | 65.2 °F | 44.34 in. |
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 21.8 °F | 38.1 °F | 2.78 in. |
| February | 25.1 °F | 43.3 °F | 2.39 in. |
| March | 34.2 °F | 53.9 °F | 3.36 in. |
| April | 44.6 °F | 66.2 °F | 4.85 in. |
| May | 55.5 °F | 75.5 °F | 5.02 in. |
| June | 64.3 °F | 84.5 °F | 4.71 in. |
| July | 67.7 °F | 87.6 °F | 4.19 in. |
| August | 65.4 °F | 86.7 °F | 3.52 in. |
| September | 57.0 °F | 80.3 °F | 3.31 in. |
| October | 45.2 °F | 68.5 °F | 3.3 in. |
| November | 35.0 °F | 54.1 °F | 3.67 in. |
| December | 26.5 °F | 42.7 °F | 2.8 in. |
| Annual | 45.2 °F | 65.1 °F | 43.9 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |
| 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 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |