Milam, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25.3 °C (high). Annual precipitation averages 1413.3 Millimeters. Milam is located in USDA Plant Hardiness Zone 9a. 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 | 2.6 °C | 15.1 °C | 140.21 mm |
| February | 4.4 °C | 17.3 °C | 113.79 mm |
| March | 8 °C | 21.3 °C | 128.02 mm |
| April | 11.9 °C | 25.2 °C | 128.78 mm |
| May | 16.7 °C | 29.2 °C | 109.98 mm |
| June | 20.7 °C | 32.5 °C | 121.67 mm |
| July | 21.8 °C | 34.1 °C | 90.42 mm |
| August | 21.6 °C | 34.6 °C | 95.5 mm |
| September | 18.4 °C | 31.6 °C | 93.22 mm |
| October | 12.2 °C | 26.6 °C | 124.21 mm |
| November | 6.9 °C | 20.4 °C | 128.02 mm |
| December | 3.5 °C | 16 °C | 139.45 mm |
| Annual | 12.4 °C | 25.3 °C | 1413.27 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |