Poplar Bluff, Missouri has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 8.9 °C (low) to 20.3 °C (high). Annual precipitation averages 1289.6 Millimeters. Poplar Bluff 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 | -3.3 °C | 6.6 °C | 88.9 mm |
| February | -1.5 °C | 9.3 °C | 89.15 mm |
| March | 3.1 °C | 14.7 °C | 115.32 mm |
| April | 8.6 °C | 20.9 °C | 147.83 mm |
| May | 14.2 °C | 25.7 °C | 133.6 mm |
| June | 19.3 °C | 30.4 °C | 99.82 mm |
| July | 21.2 °C | 31.9 °C | 111.51 mm |
| August | 20 °C | 31.4 °C | 87.38 mm |
| September | 15.5 °C | 28.1 °C | 92.2 mm |
| October | 8.7 °C | 22.1 °C | 99.06 mm |
| November | 2.9 °C | 14.5 °C | 119.38 mm |
| December | -1.4 °C | 8.3 °C | 105.41 mm |
| Annual | 8.9 °C | 20.3 °C | 1289.56 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |