Chillicothe, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.6 °F (low) to 75.9 °F (high). Annual precipitation averages 27.6 Inches. Chillicothe is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.4 °F | 54.0 °F | 1.17 in. |
| February | 31.0 °F | 57.8 °F | 1.15 in. |
| March | 39.5 °F | 67.0 °F | 1.98 in. |
| April | 47.4 °F | 75.6 °F | 2.43 in. |
| May | 58.6 °F | 84.3 °F | 4.22 in. |
| June | 68.2 °F | 92.7 °F | 3.67 in. |
| July | 71.8 °F | 97.0 °F | 2.22 in. |
| August | 70.7 °F | 96.3 °F | 2.69 in. |
| September | 62.9 °F | 88.3 °F | 2.92 in. |
| October | 50.5 °F | 77.6 °F | 2.49 in. |
| November | 38.4 °F | 64.9 °F | 1.45 in. |
| December | 29.2 °F | 54.8 °F | 1.22 in. |
| Annual | 49.6 °F | 75.9 °F | 27.61 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |