December weather forecast
Pennside, PA

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Weather in December

December, the first month of the winter in Pennside, is also a wintry month, with an average temperature varying between 41.4°F (5.2°C) and 30°F (-1.1°C).

Temperature

Start of December brings a slight shift in the average high-temperature, dipping a bit from November's cool 50.2°F (10.1°C) to a cold 41.4°F (5.2°C). Pennside observes an average low-temperature of 30°F (-1.1°C) during December nights.

Humidity

The average relative humidity in December is 80%.

Rainfall

In Pennside, during December, the rain falls for 8.4 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Pennside, during the entire year, the rain falls for 129 days and collects up to 13.5" (343mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Pennside, in December, snow falls for 3.2 days, with typically accumulated 0.39" (10mm) of snow. In Pennside, during the entire year, snow falls for 19.4 days and aggregates up to 4.45" (113mm) of snow.

Daylight

December has the shortest days of the year in Pennside, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:47 pm EST.

Sunshine

The average sunshine in December is 4.8h.

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 reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 2 in December translates into this advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.

Frequently asked questions

Is it cold during December?

In Pennside, 41.4°F (5.2°C) is the average high-temperature and 30°F (-1.1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 86°F (30°C).

What is the average humidity in December?

In Pennside, the average relative humidity in December is 80%.

How much does it rain in December?

In Pennside, in December, during 8.4 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Pennside, in December, snow falls for 3.2 days, with typically accumulated 0.39" (10mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Pennside have in December?

In December, the average day length is 9h and 21min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:07 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 4:47 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.8h.

When is 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.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Pennside, PA

Average temperature in December - Pennside, PA
  • Average high temperature in December: 41.4°F

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in December
Pennside, PA

Average pressure in December - Pennside, PA
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Pennside, PA

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

The windiest months (with the highest average wind speed) are January and March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Pennside, PA

Average humidity in December - Pennside, PA
  • Average humidity in December: 80%

The months with the highest relative humidity are February and October (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Pennside, PA

Average rainfall in December - Pennside, PA
  • Average rainfall in December: 0.91"

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is February (0.79").

Average rainfall days in December
Pennside, PA

Average rainfall days in December - Pennside, PA
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is January (7.1 days).

Average snowfall in December
Pennside, PA

Average snowfall in December - Pennside, PA
  • Average snowfall in December: 0.39"

The month with the highest snowfall is February (1.54").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Pennside, PA

Average snowfall days in December - Pennside, PA
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Pennside, PA

Average daylight in December / Average sunshine in December - Pennside, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Pennside, PA

Average sunshine days in December - Pennside, PA
  • Average sunshine days in December: 19.3 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is May (12.3 days).

Average UV index in December
Pennside, PA

Average UV index in December - Pennside, PA
  • Average UV index in December: 2

The months with the highest UV index are May, 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
Pennside, PA

Average cloud cover in December - Pennside, PA
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Pennside, PA

Average visibility in December - Pennside, PA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, November and December (6mi).
The months with the lowest visibility are May, September and October (5mi).

Pennside, Pennsylvania, USA

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