Marion, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.3 °C (low) to 26.8 °C (high). Annual precipitation averages 855.2 Millimeters. Marion is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.4 °C | 17.2 °C | 52.83 mm |
| February | 6.4 °C | 19.6 °C | 48.26 mm |
| March | 10.3 °C | 23.1 °C | 65.53 mm |
| April | 13.9 °C | 26.7 °C | 63.25 mm |
| May | 18.7 °C | 30.3 °C | 96.77 mm |
| June | 22.1 °C | 33.5 °C | 89.41 mm |
| July | 23.1 °C | 35.1 °C | 57.4 mm |
| August | 23.1 °C | 35.8 °C | 58.67 mm |
| September | 20.2 °C | 32.6 °C | 90.42 mm |
| October | 14.9 °C | 28.1 °C | 103.89 mm |
| November | 9.4 °C | 22.2 °C | 70.1 mm |
| December | 5.3 °C | 17.9 °C | 58.67 mm |
| Annual | 14.3 °C | 26.8 °C | 855.2 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |