December in Pedro Juan Caballero is the hottest month of the year. In December, the weather in Pedro Juan Caballero is typically hot. Average daily high temperature in December is about 29 degrees above zero. On average, Pedro Juan Caballero has 20 rainy, 9 sunny, and 2 partly cloudy days in December. The rains are usually heavy. December as well as January, February, March, and October is considered the most uncomfortable time to visit Pedro Juan Caballero.