December in Loreto is the windiest month of the year. In December, the weather in Loreto is typically warm. Average daily high temperature in December is about 22 degrees above zero. On average, Loreto has 20 sunny, 7 partly cloudy, 3 cloudy, and 1 rainy day in December. The rains are usually light. December as well as January, February, March, and November is considered the most comfortable time to visit Loreto.