Bryan, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.2 °C (low) to 26.2 °C (high). Annual precipitation averages 1078.7 Millimeters. Bryan is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.3 °C | 16.1 °C | 89.66 mm |
| February | 6.4 °C | 18.2 °C | 72.64 mm |
| March | 9.8 °C | 21.9 °C | 87.12 mm |
| April | 13.7 °C | 25.8 °C | 80.52 mm |
| May | 18.6 °C | 29.6 °C | 120.14 mm |
| June | 22.2 °C | 33.1 °C | 97.54 mm |
| July | 23.4 °C | 35 °C | 52.32 mm |
| August | 23.1 °C | 35.6 °C | 82.3 mm |
| September | 20.3 °C | 32.6 °C | 87.88 mm |
| October | 14.7 °C | 27.6 °C | 117.09 mm |
| November | 9.1 °C | 21.5 °C | 95.25 mm |
| December | 5.3 °C | 17.1 °C | 96.27 mm |
| Annual | 14.2 °C | 26.2 °C | 1078.73 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |