Buchanan Dam, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.8 °C (high). Annual precipitation averages 718.6 Millimeters. Buchanan Dam is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 15.7 °C | 40.13 mm |
| February | 4.4 °C | 17.7 °C | 44.7 mm |
| March | 8.4 °C | 21.7 °C | 66.04 mm |
| April | 12.4 °C | 25.8 °C | 52.83 mm |
| May | 17.4 °C | 29.3 °C | 94.23 mm |
| June | 21.3 °C | 33.1 °C | 64.77 mm |
| July | 22.7 °C | 34.9 °C | 48.26 mm |
| August | 22.7 °C | 35.6 °C | 45.21 mm |
| September | 19.4 °C | 32.1 °C | 68.07 mm |
| October | 13.6 °C | 27 °C | 78.23 mm |
| November | 7.9 °C | 20.9 °C | 60.71 mm |
| December | 3 °C | 16.2 °C | 55.37 mm |
| Annual | 13 °C | 25.8 °C | 718.55 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |