January in Kallithea is the cloudiest and the coldest month of the year. In January, the weather in Kallithea is typically warm. Average daily high temperature in January is about 12 degrees above zero. On average, Kallithea has 10 rainy, 10 sunny, 10 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February and December is considered the most uncomfortable time to visit Kallithea.