Junction, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 26.3 °C (high). Annual precipitation averages 564.9 Millimeters. Junction is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.5 °C | 16.3 °C | 23.37 mm |
| February | 1.8 °C | 18.6 °C | 28.45 mm |
| March | 6.2 °C | 22.4 °C | 46.74 mm |
| April | 10.3 °C | 26.8 °C | 51.82 mm |
| May | 15.8 °C | 30.1 °C | 73.41 mm |
| June | 19.9 °C | 33.6 °C | 72.39 mm |
| July | 20.7 °C | 35 °C | 37.85 mm |
| August | 20.4 °C | 35.4 °C | 46.74 mm |
| September | 16.8 °C | 31.8 °C | 64.26 mm |
| October | 10.8 °C | 27.3 °C | 51.56 mm |
| November | 4.7 °C | 21.2 °C | 37.85 mm |
| December | -0.1 °C | 16.9 °C | 30.48 mm |
| Annual | 10.6 °C | 26.3 °C | 564.92 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |