Mosby, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.1 °C (low) to 18 °C (high). Annual precipitation averages 1053.6 Millimeters. Mosby 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 | -7.7 °C | 3.2 °C | 30.99 mm |
| February | -5.4 °C | 6.3 °C | 41.91 mm |
| March | -0.2 °C | 12.3 °C | 63.75 mm |
| April | 5.4 °C | 18 °C | 101.85 mm |
| May | 11.6 °C | 23.3 °C | 142.75 mm |
| June | 17.2 °C | 28.5 °C | 136.14 mm |
| July | 19.6 °C | 30.8 °C | 124.21 mm |
| August | 18 °C | 30.2 °C | 112.78 mm |
| September | 13 °C | 26 °C | 112.78 mm |
| October | 6.4 °C | 19.6 °C | 88.39 mm |
| November | 0.1 °C | 11.9 °C | 54.86 mm |
| December | -5.1 °C | 5.5 °C | 43.18 mm |
| Annual | 6.1 °C | 18 °C | 1053.59 mm |
| 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 : -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 |