December weather forecast
Seven Valleys, PA

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Weather in December

The first month of the winter, December, is also a wintry month in Seven Valleys, Pennsylvania, with an average temperature varying between 42.1°F (5.6°C) and 30°F (-1.1°C).

Temperature

The arrival of December indicates a decrease in the average high-temperature, moving from a fresh 51.1°F (10.6°C) in November to an icy 42.1°F (5.6°C). December is noted for a mean low-temperature of 30°F (-1.1°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Seven Valleys, in December, it is raining for 8.1 days, with typically 0.75" (19mm) of accumulated precipitation. In Seven Valleys, during the entire year, the rain falls for 124 days and collects up to 11.85" (301mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Seven Valleys, in December, snow falls for 3.4 days, with typically accumulated 0.55" (14mm) of snow. Throughout the year, there are 18.1 snowfall days, and 3.27" (83mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:09 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:52 pm EST.

Sunshine

The average sunshine in December is 5h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Equip yourself with UVA and UVB-filtering sunglasses on clear, sunny days. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In December, the average high-temperature and low-temperature are 42.1°F (5.6°C) and 30°F (-1.1°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, is estimated at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 79%.

How many days does it rain in December?

In Seven Valleys, in December, it is raining for 8.1 days, with typically 0.75" (19mm) of accumulated precipitation.

How many days does it snow in December?

In Seven Valleys, during December, snow falls for 3.4 days and regularly aggregates up to 0.55" (14mm) 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.

What is the average length of the day in December?

In Seven Valleys, the average day length in December is 9h and 24min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:09 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:52 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index reading in December?

In Seven Valleys, the average daily maximum UV index in December is 2. A UV Index 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
Seven Valleys, PA

Average temperature in December - Seven Valleys, PA
  • Average high temperature in December: 42.1°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

Average pressure in December
Seven Valleys, PA

Average pressure in December - Seven Valleys, PA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Seven Valleys, PA

Average wind speed in December - Seven Valleys, PA
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is March (8.7mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

Average humidity in December
Seven Valleys, PA

Average humidity in December - Seven Valleys, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is April (75%).

Average rainfall in December
Seven Valleys, PA

Average rainfall in December - Seven Valleys, PA
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is May (1.38").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in December
Seven Valleys, PA

Average rainfall days in December - Seven Valleys, PA
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is May (15.1 days).
The month with the least rainy days is January (5.9 days).

Average snowfall in December
Seven Valleys, PA

Average snowfall in December - Seven Valleys, PA
  • Average snowfall in December: 0.55"

The month with the highest snowfall is January (1.02").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Seven Valleys, PA

Average snowfall days in December - Seven Valleys, PA
  • Average snowfall days in December: 3.4 days

The month with the highest number of snowfall days is January (5.8 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
Seven Valleys, PA

Average daylight in December / Average sunshine in December - Seven Valleys, 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: 5h and 0min

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
Seven Valleys, PA

Average sunshine days in December - Seven Valleys, PA
  • Average sunshine days in December: 20.5 days

The month with the most sunshine days is November (21.1 days).
The month with the least sunshine days is May (13.2 days).

Average UV index in December
Seven Valleys, PA

Average UV index in December - Seven Valleys, 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
Seven Valleys, PA

Average cloud cover in December - Seven Valleys, PA
  • Average cloud cover in December: 47

The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Seven Valleys, PA

Average visibility in December - Seven Valleys, PA
  • Average visibility in December: 6mi

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

Seven Valleys, Pennsylvania, USA

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