December in Eagle Pass is the coldest month of the year. In December, the weather in Eagle Pass is typically warm. Average daily high temperature in December is about 20 degrees above zero. On average, Eagle Pass has 15 sunny, 8 partly cloudy, 4 rainy, and 4 cloudy days in December. The rains are usually light. December as well as January, February, and November is considered the most comfortable time to visit Eagle Pass.