December weather forecast
Clarks Summit, PA

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Weather in December

December, the first month of the winter in Clarks Summit, is also an icy month, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 25.7°F (-3.5°C).

Temperature

With the onset of December, Clarks Summit experiences a modest temperature adjustment, with the average high-temperature receding from a frosty 45.5°F (7.5°C) in November to a wintry 35.6°F (2°C). In December, in Clarks Summit, the average low-temperature is a subzero cold 25.7°F (-3.5°C).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In Clarks Summit, in December, it is raining for 11.7 days, with typically 2.32" (59mm) of accumulated precipitation. In Clarks Summit, during the entire year, the rain falls for 165.6 days and collects up to 30.31" (770mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Clarks Summit, in December, during 13.4 snowfall days, 5.94" (151mm) of snow is typically accumulated. Throughout the year, there are 67.9 snowfall days, and 33.62" (854mm) of snow is accumulated.

Daylight

With an average of 9h and 12min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:10 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:43 pm EST.

Sunshine

The average sunshine in December is 3.5h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: The UV index of 1 during December translates into the following guidance:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

Clarks Summit in December has an average high-temperature of 35.6°F (2°C) and an average low-temperature of 25.7°F (-3.5°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in July is computed to be 84.2°F (29°C).

What is the average humidity in December?

In Clarks Summit, the average relative humidity in December is 84%.

How much does it rain in December?

In Clarks Summit, during December, the rain falls for 11.7 days and regularly aggregates up to 2.32" (59mm) of precipitation.

How much does it snow in December?

In Clarks Summit, during December, snow falls for 13.4 days and regularly aggregates up to 5.94" (151mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 12min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 14min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:10 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:43 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 3.5h.

What is the month with the lowest UV index?

With an average maximum UV index of 1, December is the month with the lowest UV index.

What is the UV index intensity in December?

In Clarks Summit, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
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
Clarks Summit, PA

Average temperature in December - Clarks Summit, PA
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (58.6°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average pressure in December
Clarks Summit, PA

Average pressure in December - Clarks Summit, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Clarks Summit, PA

Average wind speed in December - Clarks Summit, PA
  • Average wind speed in December: 7.8mph

The windiest months (with the highest average wind speed) are January, February, March and April (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Clarks Summit, PA

Average humidity in December - Clarks Summit, PA
  • Average humidity in December: 84%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is July (77%).

Average rainfall in December
Clarks Summit, PA

Average rainfall in December - Clarks Summit, PA
  • Average rainfall in December: 2.32"

The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is September (2.01").

Average rainfall days in December
Clarks Summit, PA

Average rainfall days in December - Clarks Summit, PA
  • Average rainfall days in December: 11.7 days

The month with the highest number of rainy days is May (19.3 days).
The month with the least rainy days is January (7.3 days).

Average snowfall in December
Clarks Summit, PA

Average snowfall in December - Clarks Summit, PA
  • Average snowfall in December: 5.94"

The month with the highest snowfall is February (9.13").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Clarks Summit, PA

Average snowfall days in December - Clarks Summit, PA
  • Average snowfall days in December: 13.4 days

The month with the highest number of snowfall days is January (16.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Clarks Summit, PA

Average daylight in December / Average sunshine in December - Clarks Summit, PA
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The months with the least sunshine are January and February (Average sunshine: 3h and 24min).

Average sunshine days in December
Clarks Summit, PA

Average sunshine days in December - Clarks Summit, PA
  • Average sunshine days in December: 10.1 days

The month with the most sunshine days is September (15 days).
The month with the least sunshine days is May (9.3 days).

Average UV index in December
Clarks Summit, PA

Average UV index in December - Clarks Summit, PA
  • Average UV index in December: 1

The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Clarks Summit, PA

Average cloud cover in December - Clarks Summit, PA
  • Average cloud cover in December: 65

The months with the most cloud cover are January, February and December (Cloud cover 65).
The month with the least cloud cover is July (Cloud cover 38).

Average visibility in December
Clarks Summit, PA

Average visibility in December - Clarks Summit, PA
  • Average visibility in December: 5mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).

Clarks Summit, Pennsylvania, USA

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