Putnam, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 76.9 °F (high). Annual precipitation averages 28.6 Inches. Putnam 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.8 °F | 57.5 °F | 1.22 in. |
| February | 35.7 °F | 61.4 °F | 1.74 in. |
| March | 43.2 °F | 69.0 °F | 2.27 in. |
| April | 50.5 °F | 77.1 °F | 2.07 in. |
| May | 60.4 °F | 84.2 °F | 3.97 in. |
| June | 68.1 °F | 91.0 °F | 3.86 in. |
| July | 71.3 °F | 95.2 °F | 1.98 in. |
| August | 70.6 °F | 95.2 °F | 2.26 in. |
| September | 63.4 °F | 87.9 °F | 2.96 in. |
| October | 52.6 °F | 78.7 °F | 2.82 in. |
| November | 41.8 °F | 66.9 °F | 2.06 in. |
| December | 33.4 °F | 58.2 °F | 1.43 in. |
| Annual | 51.9 °F | 76.9 °F | 28.64 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |