Forsyth, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.1 °F (low) to 68.9 °F (high). Annual precipitation averages 46.2 Inches. 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 | 24.1 °F | 45.8 °F | 2.79 in. |
| February | 27.2 °F | 50.4 °F | 2.56 in. |
| March | 34.8 °F | 59.7 °F | 4.22 in. |
| April | 43.8 °F | 69.5 °F | 5.25 in. |
| May | 53.6 °F | 77.2 °F | 5.25 in. |
| June | 62.5 °F | 85.6 °F | 4.28 in. |
| July | 66.2 °F | 89.7 °F | 4.0 in. |
| August | 64.7 °F | 89.0 °F | 3.02 in. |
| September | 57.0 °F | 81.9 °F | 4.51 in. |
| October | 45.2 °F | 70.8 °F | 3.75 in. |
| November | 35.2 °F | 58.9 °F | 3.92 in. |
| December | 27.3 °F | 48.6 °F | 2.63 in. |
| Annual | 45.1 °F | 68.9 °F | 46.18 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |