December weather forecast
Plymouth Meeting, PA

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Weather in December

The first month of the winter, December, is also an icy month in Plymouth Meeting, Pennsylvania, with an average temperature varying between 42.6°F (5.9°C) and 30.9°F (-0.6°C).

Temperature

The shift from November to December involves a decrease in the average high-temperature, dropping from a fresh 51.6°F (10.9°C) to a cold 42.6°F (5.9°C). Plymouth Meeting experiences an average low-temperature of 30.9°F (-0.6°C) in the month of December.

Humidity

The average relative humidity in December is 78%.

Rainfall

In Plymouth Meeting, in December, during 8.6 rainfall days, 1.22" (31mm) of precipitation is typically accumulated. Throughout the year, there are 138.2 rainfall days, and 15.59" (396mm) of precipitation is accumulated.

Snowfall

January through March, May and December are months with snowfall. December is the first month it typically snows. Throughout December, in the average 2.6 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 15.8 snowfall days, and 2.13" (54mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:45 pm EST.

Sunshine

In Plymouth Meeting, the average sunshine in December is 5h.

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 low threat to health from unsafe exposure to UV radiation for average individuals.
Note: In December, a daily UV index of 2 turns into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. To protect against the Sun's most potent rays, avoid direct exposure around midday. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Updated: Jul 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

An average high-temperature, in December, in Plymouth Meeting, is 42.6°F (5.9°C) and the average low-temperature is 30.9°F (-0.6°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is computed to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 78%.

How many days does it rain in December?

In December, the rain falls for 8.6 days. Throughout December, 1.22" (31mm) of precipitation is accumulated.

When does it start to snow?

December is the first month it typically snows. Throughout December, in the average 2.6 snowfall days, it receives 0.35" (9mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

How many hours of daylight does Plymouth Meeting have in December?

In December, the average day length is 9h and 23min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:45 pm EST.

How many hours of sunshine does Plymouth Meeting have in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index in Plymouth Meeting?

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

How high is the UV index in December?

In Plymouth Meeting, the average daily maximum UV index in December is 2. A UV Index 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
Plymouth Meeting, PA

Average temperature in December - Plymouth Meeting, PA
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Plymouth Meeting, PA

Average pressure in December - Plymouth Meeting, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Plymouth Meeting, PA

Average wind speed in December - Plymouth Meeting, PA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Plymouth Meeting, PA

Average humidity in December - Plymouth Meeting, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April and July (72%).

Average rainfall in December
Plymouth Meeting, PA

Average rainfall in December - Plymouth Meeting, PA
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is July (1.89").
The driest month (with the least rainfall) is February (0.91").

Average rainfall days in December
Plymouth Meeting, PA

Average rainfall days in December - Plymouth Meeting, PA
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is May (16 days).
The month with the least rainy days is November (7.4 days).

Average snowfall in December
Plymouth Meeting, PA

Average snowfall in December - Plymouth Meeting, PA
  • Average snowfall in December: 0.35"

The months with the highest snowfall are February and March (0.55").
The months with the least snowfall are April, June, July, August, September, October and November (0").

Average snowfall days in December
Plymouth Meeting, PA

Average snowfall days in December - Plymouth Meeting, PA
  • Average snowfall days in December: 2.6 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Plymouth Meeting, PA

Average daylight in December / Average sunshine in December - Plymouth Meeting, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Plymouth Meeting, PA

Average sunshine days in December - Plymouth Meeting, PA
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is November (20.5 days).
The months with the least sunshine days are May and June (12.8 days).

Average UV index in December
Plymouth Meeting, PA

Average UV index in December - Plymouth Meeting, PA
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (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
Plymouth Meeting, PA

Average cloud cover in December - Plymouth Meeting, PA
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Plymouth Meeting, PA

Average visibility in December - Plymouth Meeting, PA
  • Average visibility in December: 6mi

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

Plymouth Meeting, Pennsylvania, USA

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