Princeton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 24.3 °C (high). Annual precipitation averages 1057.9 Millimeters. Princeton 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 | 1.1 °C | 12.9 °C | 67.31 mm |
| February | 3.2 °C | 15.3 °C | 77.47 mm |
| March | 7.4 °C | 19.5 °C | 97.79 mm |
| April | 11.7 °C | 23.8 °C | 95.76 mm |
| May | 17 °C | 27.9 °C | 128.02 mm |
| June | 21.4 °C | 32.4 °C | 98.04 mm |
| July | 23.3 °C | 34.8 °C | 54.36 mm |
| August | 22.9 °C | 35.2 °C | 58.17 mm |
| September | 18.9 °C | 31.4 °C | 80.01 mm |
| October | 12.7 °C | 25.7 °C | 120.4 mm |
| November | 6.8 °C | 19 °C | 88.9 mm |
| December | 2.4 °C | 14.1 °C | 91.69 mm |
| Annual | 12.4 °C | 24.3 °C | 1057.92 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 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |