December in Ciechanow is the windiest month of the year. In December, the weather in Ciechanow is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Ciechanow has 14 cloudy, 8 rainy, 7 snowy, and 2 sunny days in December. The rains are usually moderate. December as well as February, March, April, and November is considered the most uncomfortable time to visit Ciechanow.