Freeport, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.2 °C (low) to 25.5 °C (high). Annual precipitation averages 1193.3 Millimeters. Freeport is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.7 °C | 17.2 °C | 102.11 mm |
| February | 9.8 °C | 18.8 °C | 65.79 mm |
| March | 13.2 °C | 21.8 °C | 74.17 mm |
| April | 16.7 °C | 24.8 °C | 76.2 mm |
| May | 21.2 °C | 28.3 °C | 93.98 mm |
| June | 24.3 °C | 31.2 °C | 113.28 mm |
| July | 25.2 °C | 32.2 °C | 93.47 mm |
| August | 24.9 °C | 32.7 °C | 127.25 mm |
| September | 22.7 °C | 30.8 °C | 151.64 mm |
| October | 18.3 °C | 27.3 °C | 99.82 mm |
| November | 13.1 °C | 22.6 °C | 104.9 mm |
| December | 8.9 °C | 18.7 °C | 90.68 mm |
| Annual | 17.2 °C | 25.5 °C | 1193.29 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |