January in Maryland Heights is the snowiest, the cloudiest, and the coldest month of the year. In January, the weather in Maryland Heights is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, Maryland Heights has 10 partly cloudy, 9 sunny, 6 cloudy, 4 rainy, and 2 snowy days in January. The rains are usually moderate. January as well as February, March, July, and December is considered the most uncomfortable time to visit Maryland Heights.