Beardstown, Illinois has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 17.5 °C (high). Annual precipitation averages 953 Millimeters. Beardstown is located in USDA Plant Hardiness Zone 6a. 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 | -8.2 °C | 1.6 °C | 50.55 mm |
| February | -6.3 °C | 4.3 °C | 43.43 mm |
| March | -0.9 °C | 11 °C | 59.18 mm |
| April | 4.8 °C | 18.2 °C | 94.74 mm |
| May | 11.4 °C | 23.8 °C | 117.35 mm |
| June | 16.6 °C | 28.6 °C | 112.78 mm |
| July | 18.4 °C | 30.4 °C | 94.23 mm |
| August | 17 °C | 29.7 °C | 89.66 mm |
| September | 12.4 °C | 26.6 °C | 84.07 mm |
| October | 5.7 °C | 19.6 °C | 77.47 mm |
| November | -0.1 °C | 11.3 °C | 76.45 mm |
| December | -4.9 °C | 4.6 °C | 53.09 mm |
| Annual | 5.5 °C | 17.5 °C | 953 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 6a : -23.3°C to -20.6°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 |