January in Belton is the coldest month of the year. In January, the weather in Belton is typically warm. Average daily high temperature in January is about 13 degrees above zero. On average, Belton has 15 sunny, 11 partly cloudy, and 5 rainy days in January. The rains are usually moderate. January as well as May, June, July, and August is considered the most uncomfortable time to visit Belton.