December in Caldas Novas is the rainiest and the cloudiest month of the year. In December, the weather in Caldas Novas is typically warm. Average daily high temperature in December is about 26 degrees above zero. On average, Caldas Novas 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 Caldas Novas.