Palmer, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.6 °C (low) to 24.9 °C (high). Annual precipitation averages 1036.3 Millimeters. Palmer is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 13.6 °C | 77.72 mm |
| February | 3.8 °C | 16.1 °C | 74.93 mm |
| March | 7.8 °C | 19.9 °C | 93.22 mm |
| April | 11.7 °C | 24.3 °C | 97.54 mm |
| May | 17.2 °C | 28.5 °C | 114.55 mm |
| June | 21.4 °C | 32.9 °C | 99.57 mm |
| July | 23.1 °C | 35.4 °C | 49.02 mm |
| August | 22.9 °C | 35.8 °C | 66.8 mm |
| September | 19.1 °C | 32.1 °C | 74.93 mm |
| October | 12.8 °C | 26.3 °C | 122.68 mm |
| November | 7.2 °C | 19.6 °C | 76.45 mm |
| December | 2.8 °C | 14.7 °C | 88.9 mm |
| Annual | 12.6 °C | 24.9 °C | 1036.31 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 |