Hayti, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.1 °C (low) to 20.8 °C (high). Annual precipitation averages 1299 Millimeters. Hayti is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 7.2 °C | 94.49 mm |
| February | -0.1 °C | 10.1 °C | 106.93 mm |
| March | 4.3 °C | 15.3 °C | 125.22 mm |
| April | 9.7 °C | 21.4 °C | 138.18 mm |
| May | 15.5 °C | 26.3 °C | 139.95 mm |
| June | 20.1 °C | 30.7 °C | 97.28 mm |
| July | 21.9 °C | 32.2 °C | 98.81 mm |
| August | 20.6 °C | 31.6 °C | 74.93 mm |
| September | 16.4 °C | 28.4 °C | 84.33 mm |
| October | 9.9 °C | 22.6 °C | 106.68 mm |
| November | 4.2 °C | 15.1 °C | 111.51 mm |
| December | 0.1 °C | 9.1 °C | 120.65 mm |
| Annual | 10.1 °C | 20.8 °C | 1298.96 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |