January in Mountain Home is the coldest month of the year. In January, the weather in Mountain Home is typically cold. Average daily high temperature in January is about 6 degrees above zero. On average, Mountain Home has 14 sunny, 13 partly cloudy, 2 rainy, and 2 cloudy days in January. The rains are usually light. January as well as February and December is considered the most uncomfortable time to visit Mountain Home.