January in Monza is the coldest month of the year. In January, the weather in Monza is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Monza has 12 sunny, 8 partly cloudy, 6 rainy, and 5 cloudy days in January. The rains are usually moderate. January as well as February, March, April, and May is considered the most uncomfortable time to visit Monza.