In December, the weather in Calas de Mallorca is typically warm. Average daily high temperature in December is about 16 degrees above zero. On average, Calas de Mallorca has 14 sunny, 8 partly cloudy, 7 rainy, and 2 cloudy days in December. The rains are usually moderate. December as well as January, February, and November is considered the most uncomfortable time to visit Calas de Mallorca.