Fairdealing, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.5 °C (low) to 20.5 °C (high). Annual precipitation averages 1284.2 Millimeters. Fairdealing is located in USDA Plant Hardiness Zone 7a. 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 | -3.6 °C | 6.8 °C | 87.88 mm |
| February | -1.8 °C | 9.8 °C | 89.15 mm |
| March | 2.7 °C | 15 °C | 115.82 mm |
| April | 8.3 °C | 21.3 °C | 144.27 mm |
| May | 13.7 °C | 25.7 °C | 136.14 mm |
| June | 18.7 °C | 30.3 °C | 93.73 mm |
| July | 20.7 °C | 32 °C | 111.76 mm |
| August | 19.6 °C | 31.6 °C | 89.15 mm |
| September | 14.9 °C | 28.1 °C | 91.69 mm |
| October | 8.1 °C | 22 °C | 98.55 mm |
| November | 2.4 °C | 14.6 °C | 119.38 mm |
| December | -1.8 °C | 8.4 °C | 106.68 mm |
| Annual | 8.5 °C | 20.5 °C | 1284.2 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 7a : -17.8°C to -15°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 |