December weather forecast
Plymouth, PA

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Weather in December

December, the first month of the winter in Plymouth, is still a cold month, with temperature in the range of an average high of 36.9°F (2.7°C) and an average low of 25.9°F (-3.4°C).

Temperature

Plymouth's December weather features a mild decline in high-temperatures, reducing from a frosty 46.2°F (7.9°C) in November to a cold 36.9°F (2.7°C). Nightly temperatures drop to an average low of 25.9°F (-3.4°C) in December.

Humidity

The months with the highest humidity are February and December, with an average relative humidity of 84%.

Rainfall

In Plymouth, in December, it is raining for 11.3 days, with typically 0.98" (25mm) of accumulated precipitation. In Plymouth, during the entire year, the rain falls for 142.7 days and collects up to 13.19" (335mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Plymouth, in December, during 10 snowfall days, 1.93" (49mm) of snow is typically accumulated. In Plymouth, during the entire year, snow falls for 49.9 days and aggregates up to 9.92" (252mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:10 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:44 pm EST.

Sunshine

The average sunshine in December in Plymouth is 3.9h.

UV index

December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: A maximum UV index of 1 in December translates into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Updated: Aug 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December in Plymouth?

The average high-temperature, in December, in Plymouth, is 36.9°F (2.7°C), while the average low-temperature is 25.9°F (-3.4°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is computed to be 86°F (30°C).

What is the most humid month?

The months with the highest humidity are February and December, with an average relative humidity of 84%.

What is the average humidity in December?

In December, the average relative humidity is 84%.

How much does it rain in December?

In December, the rain falls for 11.3 days. Throughout December, 0.98" (25mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 10 days. Throughout December, 1.93" (49mm) of snow is accumulated.

What is the month with the shortest days?

With an average of 9h and 18min of daylight, December has the shortest days of the year.

How many hours of daylight does Plymouth have in December?

In December, the average day length is 9h and 16min.

What time are sunrise and sunset in December in Plymouth?

On the first day of December, sunrise is at 7:10 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In Plymouth, the average sunshine duration in December is 3.9h.

When is the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat 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, PA

Average temperature in December - Plymouth, PA
  • Average high temperature in December: 36.9°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (30.6°F).

  • Average low temperature in December: 25.9°F

The month with the highest average low temperature is July (59.2°F).
The coldest month (with the lowest average low temperature) is January (18.7°F).

Average pressure in December
Plymouth, PA

Average pressure in December - Plymouth, 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, PA

Average wind speed in December - Plymouth, PA
  • Average wind speed in December: 7.6mph

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

Average humidity in December
Plymouth, PA

Average humidity in December - Plymouth, PA
  • Average humidity in December: 84%

The months with the highest relative humidity are February and December (84%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
Plymouth, PA

Average rainfall in December - Plymouth, PA
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is July (1.5").
The driest month (with the least rainfall) is September (0.71").

Average rainfall days in December
Plymouth, PA

Average rainfall days in December - Plymouth, PA
  • Average rainfall days in December: 11.3 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December
Plymouth, PA

Average snowfall in December - Plymouth, PA
  • Average snowfall in December: 1.93"

The month with the highest snowfall is February (2.83").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Plymouth, PA

Average snowfall days in December - Plymouth, PA
  • Average snowfall days in December: 10 days

The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 18min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and February (Average sunshine: 3h and 42min).

Average sunshine days in December
Plymouth, PA

Average sunshine days in December - Plymouth, PA
  • Average sunshine days in December: 13.7 days

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is February (11.6 days).

Average UV index in December
Plymouth, PA

Average UV index in December - Plymouth, 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
Plymouth, PA

Average cloud cover in December - Plymouth, PA
  • Average cloud cover in December: 60

The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 36).

Average visibility in December
Plymouth, PA

Average visibility in December - Plymouth, PA
  • Average visibility in December: 5mi

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

Plymouth, Pennsylvania, USA

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