Linn, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.5 °C (low) to 30 °C (high). Annual precipitation averages 597.4 Millimeters. Linn is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 9.1 °C | 21.8 °C | 23.88 mm |
| February | 11.4 °C | 24.4 °C | 26.42 mm |
| March | 14.7 °C | 27.2 °C | 31.5 mm |
| April | 17.9 °C | 30.3 °C | 34.8 mm |
| May | 21.5 °C | 33.2 °C | 64.01 mm |
| June | 23.7 °C | 35.7 °C | 65.53 mm |
| July | 24.3 °C | 36.2 °C | 57.66 mm |
| August | 24.2 °C | 36.8 °C | 41.91 mm |
| September | 22.2 °C | 33.8 °C | 121.92 mm |
| October | 18 °C | 31.1 °C | 68.58 mm |
| November | 13.4 °C | 26.4 °C | 33.78 mm |
| December | 9.6 °C | 22.6 °C | 27.43 mm |
| Annual | 17.5 °C | 30 °C | 597.42 mm |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |