Dyer, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 20.9 °C (high). Annual precipitation averages 1375.9 Millimeters. Dyer 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.2 °C | 7.9 °C | 103.38 mm |
| February | -0.6 °C | 10.4 °C | 116.84 mm |
| March | 3.8 °C | 15.6 °C | 133.1 mm |
| April | 8.9 °C | 21.4 °C | 132.59 mm |
| May | 14.6 °C | 26.1 °C | 143.76 mm |
| June | 18.9 °C | 30.2 °C | 114.81 mm |
| July | 20.8 °C | 31.9 °C | 104.65 mm |
| August | 19.6 °C | 31.6 °C | 84.07 mm |
| September | 15.4 °C | 28.4 °C | 95 mm |
| October | 8.8 °C | 22.4 °C | 99.82 mm |
| November | 3.4 °C | 15.4 °C | 115.57 mm |
| December | -0.4 °C | 9.7 °C | 132.33 mm |
| Annual | 9.3 °C | 20.9 °C | 1375.92 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |