January in Hamilton is the sunniest month of the year. In January, the weather in Hamilton is typically warm. Average daily high temperature in January is about 21 degrees above zero. On average, Hamilton has 15 partly cloudy, 11 sunny, 4 rainy, and 1 cloudy day in January. The rains are usually moderate. January as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Hamilton.