December weather forecast
Mount Penn, PA

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Weather in December

The first month of the winter, December, is still a cold month in Mount Penn, Pennsylvania, with temperature in the range of an average low of 30°F (-1.1°C) and an average high of 41.4°F (5.2°C).

Temperature

The beginning of December subtly marks a decrease in the average high-temperature, transitioning from a cool 50.2°F (10.1°C) in November to an icy 41.4°F (5.2°C). Throughout December, Mount Penn records an average temperature of 30°F (-1.1°C) at night.

Humidity

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

Rainfall

In Mount Penn, in December, during 8.4 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. Throughout the year, there are 129 rainfall days, and 13.5" (343mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In Mount Penn, in December, during 3.2 snowfall days, 0.39" (10mm) of snow is typically accumulated. Throughout the year, there are 19.4 snowfall days, and 4.45" (113mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year in Mount Penn.
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.

Sunshine

In December, the average sunshine 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 of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.

Frequently asked questions

How cold does it get in December?

In December, the average high-temperature and low-temperature in Mount Penn, Pennsylvania, are 41.4°F (5.2°C) and 30°F (-1.1°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 86°F (30°C).

What is the average humidity in December?

In December, the average relative humidity is 80%.

How much does it rain in December?

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

How much does it snow in Mount Penn in December?

In Mount Penn, 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 Mount Penn 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 many hours of sunshine does Mount Penn have in December?

In Mount Penn, the average sunshine duration in December is 4.8h.

What is the month with 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 Mount Penn, the average daily maximum UV index in December 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
Mount Penn, PA

Average temperature in December - Mount Penn, 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
Mount Penn, PA

Average pressure in December - Mount 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
Mount Penn, PA

Average wind speed in December - Mount Penn, 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
Mount Penn, PA

Average humidity in December - Mount Penn, 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
Mount Penn, PA

Average rainfall in December - Mount Penn, 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
Mount Penn, PA

Average rainfall days in December - Mount Penn, 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
Mount Penn, PA

Average snowfall in December - Mount Penn, 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
Mount Penn, PA

Average snowfall days in December - Mount Penn, 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
Mount Penn, PA

Average daylight in December / Average sunshine in December - Mount Penn, 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
Mount Penn, PA

Average sunshine days in December - Mount Penn, 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
Mount Penn, PA

Average UV index in December - Mount Penn, 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
Mount Penn, PA

Average cloud cover in December - Mount Penn, 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
Mount Penn, PA

Average visibility in December - Mount Penn, 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).

Mount Penn, Pennsylvania, USA

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