December in Juniata is the snowiest month of the year. In December, the weather in Juniata is typically cold. Average daily high temperature in December is about 1 degree above zero. On average, Juniata has 16 partly cloudy, 11 sunny, 3 cloudy, and 1 snowy day in December. December as well as January and February is considered the most uncomfortable time to visit Juniata.