Average temperatures in Harlingen in the time of December is 13 with a normal high in the month being 22 and lows being 9 degrees. We have put some more details below:
| Month | Degrees Celsius |
|---|---|
| Temperature | 13 |
| High Temperature | 22 |
| Low Temperature | 9 |
| Sunshine Per Day | 7 |
Useful Links: Harlingen Weather: Average Weather & Yearly Climate