Bastrop, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 26.8 °C (high). Annual precipitation averages 932.4 Millimeters. Bastrop is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.2 °C | 16.8 °C | 70.61 mm |
| February | 5.4 °C | 18.7 °C | 55.37 mm |
| March | 9.2 °C | 22.6 °C | 74.93 mm |
| April | 13 °C | 26.5 °C | 77.98 mm |
| May | 18.2 °C | 30.2 °C | 119.63 mm |
| June | 21.8 °C | 33.8 °C | 77.98 mm |
| July | 22.8 °C | 35.6 °C | 49.78 mm |
| August | 22.7 °C | 36.2 °C | 79.25 mm |
| September | 19.6 °C | 32.9 °C | 68.83 mm |
| October | 13.8 °C | 28.2 °C | 107.7 mm |
| November | 8.2 °C | 22 °C | 71.88 mm |
| December | 4.1 °C | 17.6 °C | 78.49 mm |
| Annual | 13.5 °C | 26.8 °C | 932.43 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |