Chambersburg Weather in December

The climate in Chambersburg during December can be summarized as cold and a little damp.

December is in the winter in Chambersburg and is typically the 3rd coldest month of the year. Daytime maximum temperatures average around a cold 4°C (40°F), whilst at night -4°C (24°F) is normal.

On average December is the 4th driest month of the year in Chambersburg with around 83mm 3.3 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.

On the flip side this corresponds to an average of 4.1 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Chambersburg in December 2025.