Schulenburg, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 14.6 °C (low) to 26.4 °C (high). Annual precipitation averages 960.4 Millimeters. Schulenburg is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5 °C | 16.8 °C | 73.15 mm |
| February | 7.2 °C | 18.8 °C | 56.13 mm |
| March | 10.7 °C | 22.4 °C | 72.64 mm |
| April | 14.2 °C | 26.2 °C | 75.18 mm |
| May | 18.8 °C | 29.8 °C | 110.49 mm |
| June | 22.1 °C | 33.1 °C | 96.77 mm |
| July | 22.8 °C | 34.6 °C | 51.05 mm |
| August | 23.1 °C | 35.4 °C | 66.55 mm |
| September | 20.3 °C | 32.3 °C | 82.04 mm |
| October | 15.1 °C | 27.8 °C | 112.27 mm |
| November | 9.7 °C | 21.9 °C | 82.55 mm |
| December | 5.9 °C | 17.8 °C | 81.53 mm |
| Annual | 14.6 °C | 26.4 °C | 960.35 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| 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 |