Philadelphia, Mississippi has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 24.2 °C (high). Annual precipitation averages 1470.9 Millimeters. Philadelphia is located in USDA Plant Hardiness Zone 8b. 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 | 1.3 °C | 13.4 °C | 146.56 mm |
| February | 2.9 °C | 15.9 °C | 142.75 mm |
| March | 6.5 °C | 20.3 °C | 138.94 mm |
| April | 10.6 °C | 24.3 °C | 156.97 mm |
| May | 15.4 °C | 28.3 °C | 106.17 mm |
| June | 19.7 °C | 31.9 °C | 100.08 mm |
| July | 21.2 °C | 33.2 °C | 131.57 mm |
| August | 20.7 °C | 32.9 °C | 123.19 mm |
| September | 17.5 °C | 30.6 °C | 87.38 mm |
| October | 10.9 °C | 25.4 °C | 96.27 mm |
| November | 5.2 °C | 19.2 °C | 111.51 mm |
| December | 2.5 °C | 14.7 °C | 129.54 mm |
| Annual | 11.2 °C | 24.2 °C | 1470.93 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 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |