December in Brazzaville is the coldest month of the year. In December, the weather in Brazzaville is typically warm. Average daily high temperature in December is about 27 degrees above zero. On average, Brazzaville has 30 rainy and 1 sunny day in December. The rains are usually heavy. December as well as January, February, March, and April is considered the most uncomfortable time to visit Brazzaville.