December in Loviisa is the windiest month of the year. In December, the weather in Loviisa is typically freezing. Average daily high temperature in December is about zero. On average, Loviisa has 13 snowy, 10 cloudy, 7 rainy, and 1 sunny day in December. The snowfalls are usually moderate. December as well as March, April, October, and November is considered the most uncomfortable time to visit Loviisa.