December weather forecast
East William Penn, PA

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Weather in December

December, the first month of the winter in East William Penn, is still a cold month, with temperature in the range of an average low of 27.5°F (-2.5°C) and an average high of 37.9°F (3.3°C).

Temperature

December's onset brings a slight change in high-temperatures, falling from a chilly 47.3°F (8.5°C) in November to a cold 37.9°F (3.3°C). East William Penn's average low-temperature in the month of December is recorded at a subzero cold 27.5°F (-2.5°C).

Humidity

In East William Penn, the average relative humidity in December is 82%.

Rainfall

In East William Penn, in December, during 12.6 rainfall days, 2.87" (73mm) of precipitation is typically accumulated. In East William Penn, during the entire year, the rain falls for 171 days and collects up to 34.25" (870mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In East William Penn, in December, snow falls for 8.6 days, with typically accumulated 3.9" (99mm) of snow. Throughout the year, there are 48.5 snowfall days, and 27.72" (704mm) of snow is accumulated.

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 4:37 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:47 pm EST.

Sunshine

In December, the average sunshine is 4.4h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index in East William Penn, Pennsylvania. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Enhance your sun protection with tightly woven, yet airy clothing. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Updated: Aug 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

In December, the average high-temperature and low-temperature are 37.9°F (3.3°C) and 27.5°F (-2.5°C) respectively. In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, is evaluated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 82%.

How much does it rain in December?

In East William Penn, in December, during 12.6 rainfall days, 2.87" (73mm) of precipitation is typically accumulated.

How many days does it snow in December?

In East William Penn, in December, snow falls for 8.6 days, with typically accumulated 3.9" (99mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does East William Penn have in December?

The average day length in December is 9h and 18min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:10 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:47 pm EST.

How long on average sun shines in December in East William Penn?

In East William Penn, the average sunshine duration in December is 4.4h.

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 East William Penn?

In East William Penn, the average daily maximum UV index in December is 2. 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
East William Penn, PA

Average temperature in December - East William Penn, PA
  • Average high temperature in December: 37.9°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in December
East William Penn, PA

Average pressure in December - East William Penn, 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
East William Penn, PA

Average wind speed in December - East William Penn, PA
  • Average wind speed in December: 7.7mph

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

Average humidity in December
East William Penn, PA

Average humidity in December - East William Penn, PA
  • Average humidity in December: 82%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
East William Penn, PA

Average rainfall in December - East William Penn, PA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is September (1.97").

Average rainfall days in December
East William Penn, PA

Average rainfall days in December - East William Penn, PA
  • Average rainfall days in December: 12.6 days

The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is January (9.7 days).

Average snowfall in December
East William Penn, PA

Average snowfall in December - East William Penn, PA
  • Average snowfall in December: 3.9"

The month with the highest snowfall is January (7.24").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
East William Penn, PA

Average snowfall days in December - East William Penn, PA
  • Average snowfall days in December: 8.6 days

The month with the highest number of snowfall days is January (12.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
East William Penn, PA

Average daylight in December / Average sunshine in December - East William Penn, 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: 4h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 18min).

Average sunshine days in December
East William Penn, PA

Average sunshine days in December - East William Penn, PA
  • Average sunshine days in December: 13.6 days

The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is May (9.1 days).

Average UV index in December
East William Penn, PA

Average UV index in December - East William Penn, PA
  • Average UV index in December: 2

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in December
East William Penn, PA

Average cloud cover in December - East William Penn, PA
  • Average cloud cover in December: 54

The month with the most cloud cover is February (Cloud cover 55).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
East William Penn, PA

Average visibility in December - East William Penn, 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).

East William Penn, Pennsylvania, USA

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