Celina, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.3 °C (low) to 24.2 °C (high). Annual precipitation averages 1042.7 Millimeters. Celina 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 | 0.8 °C | 12.6 °C | 59.69 mm |
| February | 2.8 °C | 15 °C | 72.64 mm |
| March | 7 °C | 19.2 °C | 95.5 mm |
| April | 11.4 °C | 23.7 °C | 93.47 mm |
| May | 16.7 °C | 27.8 °C | 137.16 mm |
| June | 21.4 °C | 32.4 °C | 99.06 mm |
| July | 23.6 °C | 35.2 °C | 55.63 mm |
| August | 23.2 °C | 35.3 °C | 63.5 mm |
| September | 19.1 °C | 31.2 °C | 82.8 mm |
| October | 12.8 °C | 25.4 °C | 121.16 mm |
| November | 6.7 °C | 18.7 °C | 81.03 mm |
| December | 1.9 °C | 13.7 °C | 81.03 mm |
| Annual | 12.3 °C | 24.2 °C | 1042.67 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 |