Forsyth, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.3 °C (low) to 20.5 °C (high). Annual precipitation averages 1173 Millimeters. Forsyth is located in USDA Plant Hardiness Zone 7a. 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 | -4.4 °C | 7.7 °C | 70.87 mm |
| February | -2.7 °C | 10.2 °C | 65.02 mm |
| March | 1.6 °C | 15.4 °C | 107.19 mm |
| April | 6.6 °C | 20.8 °C | 133.35 mm |
| May | 12 °C | 25.1 °C | 133.35 mm |
| June | 16.9 °C | 29.8 °C | 108.71 mm |
| July | 19 °C | 32.1 °C | 101.6 mm |
| August | 18.2 °C | 31.7 °C | 76.71 mm |
| September | 13.9 °C | 27.7 °C | 114.55 mm |
| October | 7.3 °C | 21.6 °C | 95.25 mm |
| November | 1.8 °C | 14.9 °C | 99.57 mm |
| December | -2.6 °C | 9.2 °C | 66.8 mm |
| Annual | 7.3 °C | 20.5 °C | 1172.97 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |