December weather forecast in Osa

December in Osa is the snowiest month of the year. In December, the weather in Osa is typically freezing. Average daily high temperature in December is about 14 degrees below zero. On average, Osa has 10 cloudy, 9 partly cloudy, 6 snowy, and 6 sunny days in December. The snowfalls are usually light. December as well as January and February is considered the most uncomfortable time to visit Osa.