December weather forecast
Brier Hill, PA

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Weather in December

December, the first month of the winter in Brier Hill, is still a cold month, with an average temperature varying between 40.1°F (4.5°C) and 28.8°F (-1.8°C).

Temperature

The onset of December brings a small change in high-temperatures, falling from a fresh 50°F (10°C) in November to an icy 40.1°F (4.5°C). During December nights, Brier Hill records an average temperature of 28.8°F (-1.8°C).

Humidity

In December, the average relative humidity is 83%.

Rainfall

In December, the rain falls for 5 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 82.6 rainfall days, and 6.1" (155mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

Daylight

December has the shortest days of the year in Brier Hill, Pennsylvania, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:40 am and sunset at 5:04 pm EST.

Sunshine

In December, the average sunshine is 3.5h.

UV index

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.
Note: In December, a regular UV index of 2 translates into these guidelines:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Enhance your sun protection with tightly woven, yet airy clothing. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

An average high-temperature, in December, in Brier Hill, is 40.1°F (4.5°C) and the average low-temperature is 28.8°F (-1.8°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 83%.

How much does it rain in December?

In Brier Hill, during December, the rain falls for 5 days and regularly aggregates up to 0.51" (13mm) of precipitation.

When does it snow the most?

The months with the most snowfall are February and December, with an average 0.35" (9mm) of accumulated snow.

How much does it snow in December?

In December, in Brier Hill, it is snowing for 3.6 days. Throughout December, 0.35" (9mm) of snow is accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 23min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:22 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:40 am and sunset at 5:04 pm EST.

How many hours of sunshine does Brier Hill have in December?

The average sunshine duration in December is 3.5h.

When is the lowest UV index?

January through March, October through 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 December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Brier Hill, PA

Average temperature in December - Brier Hill, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.8°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 (21.2°F).

Average pressure in December
Brier Hill, PA

Average pressure in December - Brier Hill, 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 (29.95"Hg).

Average wind speed in December
Brier Hill, PA

Average wind speed in December - Brier Hill, PA
  • Average wind speed in December: 7.2mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in December
Brier Hill, PA

Average humidity in December - Brier Hill, PA
  • Average humidity in December: 83%

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are April, July, August and November (77%).

Average rainfall in December
Brier Hill, PA

Average rainfall in December - Brier Hill, PA
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (0.71").
The driest month (with the least rainfall) is September (0.28").

Average rainfall days in December
Brier Hill, PA

Average rainfall days in December - Brier Hill, PA
  • Average rainfall days in December: 5 days

The month with the highest number of rainy days is July (9.8 days).
The month with the least rainy days is February (4 days).

Average snowfall in December
Brier Hill, PA

Average snowfall in December - Brier Hill, PA
  • Average snowfall in December: 0.35"

The months with the highest snowfall are February and December (0.35").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Brier Hill, PA

Average snowfall days in December - Brier Hill, PA
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Brier Hill, PA

Average daylight in December / Average sunshine in December - Brier Hill, 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: 3h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 0min).

Average sunshine days in December
Brier Hill, PA

Average sunshine days in December - Brier Hill, PA
  • Average sunshine days in December: 22.4 days

The month with the most sunshine days is November (23.2 days).
The month with the least sunshine days is June (17.3 days).

Average UV index in December
Brier Hill, PA

Average UV index in December - Brier Hill, 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, October, November and December (UV index 2).

Average cloud cover in December
Brier Hill, PA

Average cloud cover in December - Brier Hill, PA
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Brier Hill, PA

Average visibility in December - Brier Hill, PA
  • Average visibility in December: 5mi

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

Brier Hill, Pennsylvania, USA

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