Tynan, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.3 °C (low) to 27.9 °C (high). Annual precipitation averages 763.3 Millimeters. Tynan is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.2 °C | 19.3 °C | 41.4 mm |
| February | 9.3 °C | 21.4 °C | 37.59 mm |
| March | 12.9 °C | 24.5 °C | 58.93 mm |
| April | 16.2 °C | 27.8 °C | 50.04 mm |
| May | 20.4 °C | 30.8 °C | 79.5 mm |
| June | 23.1 °C | 33.8 °C | 80.26 mm |
| July | 23.7 °C | 34.7 °C | 78.99 mm |
| August | 23.7 °C | 35.6 °C | 59.18 mm |
| September | 21.7 °C | 32.9 °C | 115.57 mm |
| October | 17.1 °C | 29.4 °C | 72.14 mm |
| November | 11.9 °C | 24.3 °C | 44.96 mm |
| December | 8.2 °C | 20.3 °C | 44.7 mm |
| Annual | 16.3 °C | 27.9 °C | 763.26 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |