December weather forecastChambersburg, PA
December
Weather in December
December in Chambersburg, Pennsylvania is a winter marvel. The weather sees a transition towards cold and the rainfall is almost equal to that in November. The fall of the first heavy snow in December turns the City into a winter wonderland. The temperature; however, has not reached its January low. A notable feature is that the visibility rises to 6 miles in December, proving a clear sight even during snowy days. The town is beautifully decked up during the festive season blending perfectly with the winters.Temperature
The transition into December involves a decrease in the average high-temperature, falling from a fresh 50°F (10°C) in November to a wintry 40.8°F (4.9°C). During the month of December, Chambersburg experiences a steady low-temperature average of 28.9°F (-1.7°C).Humidity
In Chambersburg, the average relative humidity in December is 79%.Rainfall
In December, in Chambersburg, the rain falls for 10.8 days. Throughout December, 2.05" (52mm) of precipitation is accumulated. Throughout the year, in Chambersburg, there are 156 rainfall days, and 27.2" (691mm) of precipitation is accumulated.Snowfall
Months with snowfall in Chambersburg, Pennsylvania, are January through May, October through December. In Chambersburg, in December, during 4.2 snowfall days, 1.73" (44mm) of snow is typically accumulated. Throughout the year, there are 28.8 snowfall days, and 15.39" (391mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:13 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 4:55 pm EST.
Sunshine
The average sunshine in December is 4.6h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: A daily maximum UV index of 2 in December translates into the following instructions:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Chambersburg, PA
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).
- Average low temperature in December: 28.9°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is January (22.1°F).
Average pressure in December
Chambersburg, PA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
Chambersburg, PA
- Average wind speed in December: 7.2mph
The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Chambersburg, PA
- Average humidity in December: 79%
The months with the highest relative humidity are February and October (80%).
The month with the lowest relative humidity is July (75%).
Average rainfall in December
Chambersburg, PA
- Average rainfall in December: 2.05"
The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (1.85").
Average rainfall days in December
Chambersburg, PA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (7.3 days).
Average snowfall in December
Chambersburg, PA
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (4.92").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Chambersburg, PA
- Average snowfall days in December: 4.2 days
The month with the highest number of snowfall days is January (8.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Chambersburg, PA
- Average daylight in December: 9h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 4h and 36min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in December
Chambersburg, PA
- Average sunshine days in December: 16.6 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (11.6 days).
Average UV index in December
Chambersburg, PA
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Chambersburg, PA
- Average cloud cover in December: 52
The months with the most cloud cover are January, February and December (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Chambersburg, PA
- Average visibility in December: 6mi
The months with the highest visibility are April, June, July, November and December (6mi).
The months with the lowest visibility are January, February, March, May, August, September and October (5mi).
