December in Kempton Park is the cloudiest and the warmest month of the year. In December, the weather in Kempton Park is typically warm. Average daily high temperature in December is about 25 degrees above zero. On average, Kempton Park has 12 rainy, 12 partly cloudy, and 7 sunny days in December. The rains are usually light. December as well as January is considered the most uncomfortable time to visit Kempton Park.