January in Mary is the cloudiest and the coldest month of the year. In January, the weather in Mary is typically cold. Average daily high temperature in January is about 8 degrees above zero. On average, Mary has 16 sunny, 13 partly cloudy, 1 rainy, and 1 cloudy day in January. The rains are usually light. January as well as February, June, July, and August is considered the most uncomfortable time to visit Mary.