December in Ongar is the snowiest and the windiest month of the year. In December, the weather in Ongar is typically freezing. Average daily high temperature in December is about 8 degrees below zero. On average, Ongar has 17 cloudy, 7 snowy, 5 sunny, and 2 partly cloudy days in December. The snowfalls are usually light. December as well as January and February is considered the most uncomfortable time to visit Ongar.