Poseyville, Indiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.9 °C (low) to 19.3 °C (high). Annual precipitation averages 1218.5 Millimeters. Poseyville 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 | -4.3 °C | 4.8 °C | 91.19 mm |
| February | -2.8 °C | 7.6 °C | 79.25 mm |
| March | 1.7 °C | 13.1 °C | 114.05 mm |
| April | 7.5 °C | 19.7 °C | 127.76 mm |
| May | 13.4 °C | 25.1 °C | 133.86 mm |
| June | 18.2 °C | 29.7 °C | 110.49 mm |
| July | 19.9 °C | 31.3 °C | 112.01 mm |
| August | 18.8 °C | 30.8 °C | 77.47 mm |
| September | 14.5 °C | 27.8 °C | 87.88 mm |
| October | 8.1 °C | 21.2 °C | 87.38 mm |
| November | 2.1 °C | 13.3 °C | 99.57 mm |
| December | -2.3 °C | 7.1 °C | 97.54 mm |
| Annual | 7.9 °C | 19.3 °C | 1218.45 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |