December weather forecast
Penn Valley, PA

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Weather in December

The first month of the winter, December, is also a frosty month in Penn Valley, Pennsylvania, with an average temperature varying between 43.2°F (6.2°C) and 32°F (0°C).

Temperature

The transition into December involves a small decrease in the average high-temperature, dipping slightly from a cool 52°F (11.1°C) in November to a frosty 43.2°F (6.2°C). Throughout the month of December, Penn Valley reports a steady low-temperature average of 32°F (0°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Penn Valley, during December, the rain falls for 6.5 days and regularly aggregates up to 0.91" (23mm) of precipitation. In Penn Valley, during the entire year, the rain falls for 111.8 days and collects up to 9.69" (246mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Penn Valley. In Penn Valley, in December, during 2.1 snowfall days, 0.63" (16mm) of snow is typically accumulated. Throughout the year, there are 15.1 snowfall days, and 3.66" (93mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:04 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:45 pm EST.

Sunshine

In Penn Valley, the average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. To protect against the Sun's most potent rays, avoid direct exposure around midday. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 43.2°F (6.2°C) and a low-temperature of 32°F (0°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

How much does it rain in December?

In Penn Valley, in December, during 6.5 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.

How much does it snow in December?

In Penn Valley, during December, snow falls for 2.1 days and regularly aggregates up to 0.63" (16mm) of snow.

What is the month with the shortest days in Penn Valley?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

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

When 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 7:22 am and sunset at 4:45 pm EST.

How long on average sun shines in December?

In Penn Valley, the average sunshine duration in December is 4.9h.

What is the month with the lowest UV index?

January, February, 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 December, the average daily maximum UV index 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
Penn Valley, PA

Average temperature in December - Penn Valley, PA
  • Average high temperature in December: 43.2°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in December: 32°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in December
Penn Valley, PA

Average pressure in December - Penn Valley, 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
Penn Valley, PA

Average wind speed in December - Penn Valley, PA
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity in December
Penn Valley, PA

Average humidity in December - Penn Valley, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (78%).
The months with the lowest relative humidity are April, July and August (71%).

Average rainfall in December
Penn Valley, PA

Average rainfall in December - Penn Valley, PA
  • Average rainfall in December: 0.91"

The wettest months (with the highest rainfall) are July and August (1.14").
The driest month (with the least rainfall) is January (0.55").

Average rainfall days in December
Penn Valley, PA

Average rainfall days in December - Penn Valley, PA
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is January (5.3 days).

Average snowfall in December
Penn Valley, PA

Average snowfall in December - Penn Valley, PA
  • Average snowfall in December: 0.63"

The months with the highest snowfall are February and March (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Penn Valley, PA

Average snowfall days in December - Penn Valley, PA
  • Average snowfall days in December: 2.1 days

The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Penn Valley, PA

Average daylight in December / Average sunshine in December - Penn Valley, 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 36min).

Average sunshine days in December
Penn Valley, PA

Average sunshine days in December - Penn Valley, PA
  • Average sunshine days in December: 22.2 days

The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (14.9 days).

Average UV index in December
Penn Valley, PA

Average UV index in December - Penn Valley, 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, November and December (UV index 2).

Average cloud cover in December
Penn Valley, PA

Average cloud cover in December - Penn Valley, 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 32).

Average visibility in December
Penn Valley, PA

Average visibility in December - Penn Valley, PA
  • Average visibility in December: 6mi

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

Penn Valley, Pennsylvania, USA

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