December in Montes Claros is the rainiest month of the year. In December, the weather in Montes Claros is typically warm. Average daily high temperature in December is about 26 degrees above zero. On average, Montes Claros has 27 rainy and 4 sunny days in December. The rains are usually heavy. December as well as January, March, and November is considered the most uncomfortable time to visit Montes Claros.