Hardin, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.1 °C (low) to 18.5 °C (high). Annual precipitation averages 1081.8 Millimeters. Hardin is located in USDA Plant Hardiness Zone 6b. 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 | -6.1 °C | 3.5 °C | 64.77 mm |
| February | -4.3 °C | 6.4 °C | 62.99 mm |
| March | 0.7 °C | 12.5 °C | 84.33 mm |
| April | 6.6 °C | 19.2 °C | 113.28 mm |
| May | 12.8 °C | 24.3 °C | 128.02 mm |
| June | 17.8 °C | 29.1 °C | 113.79 mm |
| July | 19.7 °C | 30.9 °C | 100.84 mm |
| August | 18.6 °C | 30.4 °C | 87.88 mm |
| September | 13.7 °C | 26.8 °C | 87.63 mm |
| October | 7.4 °C | 20.2 °C | 81.79 mm |
| November | 1.4 °C | 12.4 °C | 88.39 mm |
| December | -3.6 °C | 6 °C | 68.07 mm |
| Annual | 7.1 °C | 18.5 °C | 1081.78 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |