December weather forecast
Chambersburg, PA

Share

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.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature and low-temperature in Chambersburg during December are 40.8°F (4.9°C) and 28.9°F (-1.7°C) respectively. The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in August is estimated at 87.8°F (31°C).

What is the average humidity in December?

In Chambersburg, the average relative humidity in December is 79%.

How many days does it rain in December?

In Chambersburg, Pennsylvania, during December, the rain falls for 10.8 days and regularly aggregates up to 2.05" (52mm) of precipitation.

How many days does it snow in December?

In Chambersburg, Pennsylvania, in December, during 4.2 snowfall days, 1.73" (44mm) of snow is typically accumulated.

What is the month with the shortest days in Chambersburg?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

How many hours of daylight does Chambersburg have in December?

The average day length in December is 9h and 23min.

What time are sunrise and sunset in December?

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.

How many hours of sunshine does Chambersburg have in December?

In December, the average sunshine duration in Chambersburg is 4.6h.

What are the months with the lowest UV index?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

In Chambersburg, Pennsylvania, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Chambersburg, PA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in December - Chambersburg, PA
  • Average daylight in December: 9h and 2min

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 4min

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 - 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 - 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 - 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 - 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).

Chambersburg, Pennsylvania, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location