December weather forecast
Llewellyn, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Llewellyn, Pennsylvania, with an average temperature ranging between min 27.9°F (-2.3°C) and max 38.8°F (3.8°C).

Temperature

In December, the meteorological conditions alter, with the average high-temperature shifting from a frosty 47.8°F (8.8°C) in November to a cold 38.8°F (3.8°C). The nighttime temperature dips to a freezing cold 27.9°F (-2.3°C) on average during December.

Humidity

The average relative humidity in December is 81%.

Rainfall

In Llewellyn, in December, during 9.5 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 146 rainfall days, and 26.42" (671mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Llewellyn, in December, during 3.1 snowfall days, 1.46" (37mm) of snow is typically accumulated. In Llewellyn, during the entire year, snow falls for 23 days and aggregates up to 13.46" (342mm) of snow.

Daylight

With an average of 9h and 18min 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 4:38 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:48 pm EST.

Sunshine

In Llewellyn, the average sunshine in December is 4.5h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

Frequently asked questions

Is December cold?

In Llewellyn, 38.8°F (3.8°C) is the average high-temperature and 27.9°F (-2.3°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is evaluated at 87.8°F (31°C).

What is the average humidity in December?

In Llewellyn, the average relative humidity in December is 81%.

How much does it rain in December?

In Llewellyn, in December, during 9.5 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 3.1 days. Throughout December, 1.46" (37mm) 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 Llewellyn have in December?

The average day length in December is 9h and 19min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:10 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:48 pm EST.

How many hours of sunshine does Llewellyn have in December?

In Llewellyn, the average sunshine duration in December is 4.5h.

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.

How high is the UV index in December?

In Llewellyn, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe 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
Llewellyn, PA

Average temperature in December - Llewellyn, PA
  • Average high temperature in December: 38.8°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (32.7°F).

  • Average low temperature in December: 27.9°F

The month with the highest average low temperature is July (61.7°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure in December
Llewellyn, PA

Average pressure in December - Llewellyn, 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
Llewellyn, PA

Average wind speed in December - Llewellyn, PA
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Llewellyn, PA

Average humidity in December - Llewellyn, PA
  • Average humidity in December: 81%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
Llewellyn, PA

Average rainfall in December - Llewellyn, PA
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.69").

Average rainfall days in December
Llewellyn, PA

Average rainfall days in December - Llewellyn, PA
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (5.7 days).

Average snowfall in December
Llewellyn, PA

Average snowfall in December - Llewellyn, PA
  • Average snowfall in December: 1.46"

The month with the highest snowfall is March (3.86").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Llewellyn, PA

Average snowfall days in December - Llewellyn, PA
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is February (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Llewellyn, 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 18min).

  • Average sunshine in December: 4h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 24min).

Average sunshine days in December
Llewellyn, PA

Average sunshine days in December - Llewellyn, PA
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (10.8 days).

Average UV index in December
Llewellyn, PA

Average UV index in December - Llewellyn, 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
Llewellyn, PA

Average cloud cover in December - Llewellyn, PA
  • Average cloud cover in December: 53

The months with the most cloud cover are February and December (Cloud cover 53).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Llewellyn, PA

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

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

Llewellyn, Pennsylvania, USA

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