Belle, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 18.7 °C (high). Annual precipitation averages 1142.8 Millimeters. Belle 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. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 4.7 °C | 64.01 mm |
| February | -3.8 °C | 7.5 °C | 60.45 mm |
| March | 0.8 °C | 13.1 °C | 92.2 mm |
| April | 6.7 °C | 19.2 °C | 119.38 mm |
| May | 12.4 °C | 23.8 °C | 135.89 mm |
| June | 17.3 °C | 28.3 °C | 115.32 mm |
| July | 19.6 °C | 30.9 °C | 112.01 mm |
| August | 18.6 °C | 30.5 °C | 100.84 mm |
| September | 14.2 °C | 26.5 °C | 104.14 mm |
| October | 7.7 °C | 20.1 °C | 81.28 mm |
| November | 1.7 °C | 12.9 °C | 89.92 mm |
| December | -3.2 °C | 6.9 °C | 67.31 mm |
| Annual | 7.2 °C | 18.7 °C | 1142.75 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 |