Normanna, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.1 °F (low) to 82.2 °F (high). Annual precipitation averages 30.7 Inches. Normanna is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 43.6 °F | 66.3 °F | 1.88 in. |
| February | 47.5 °F | 70.0 °F | 1.58 in. |
| March | 54.0 °F | 75.7 °F | 2.4 in. |
| April | 59.7 °F | 81.9 °F | 2.34 in. |
| May | 67.6 °F | 87.9 °F | 3.32 in. |
| June | 72.7 °F | 93.2 °F | 3.36 in. |
| July | 73.8 °F | 94.9 °F | 2.95 in. |
| August | 73.7 °F | 96.5 °F | 2.41 in. |
| September | 69.7 °F | 91.5 °F | 4.06 in. |
| October | 61.4 °F | 85.1 °F | 2.67 in. |
| November | 52.1 °F | 75.3 °F | 1.91 in. |
| December | 45.2 °F | 67.9 °F | 1.83 in. |
| Annual | 60.1 °F | 82.2 °F | 30.71 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |