December weather forecast
Bristol, PA

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Weather in December

December, the first month of the winter in Bristol, is still a chilly month, with an average temperature ranging between max 43.7°F (6.5°C) and min 32.4°F (0.2°C).

Temperature

The arrival of December suggests a slight decrease in the average high-temperature, moving from a fresh 52.3°F (11.3°C) in November to a frosty 43.7°F (6.5°C). Throughout December, the nighttime temperature averages to a cold 32.4°F (0.2°C).

Humidity

In December, the average relative humidity in Bristol is 77%.

Rainfall

In Bristol, in December, during 10.9 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. In Bristol, during the entire year, the rain falls for 154.4 days and collects up to 31.38" (797mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Bristol, during December, snow falls for 2.8 days and regularly aggregates up to 1.22" (31mm) of snow. Throughout the year, there are 15.9 snowfall days, and 8.5" (216mm) 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 7:02 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:44 pm EST.

Sunshine

In December, the average sunshine in Bristol 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 of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
Updated: Jun 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Bristol, is 43.7°F (6.5°C), while the low-temperature averages to 32.4°F (0.2°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, is computed to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

How many days does it rain in December?

In Bristol, in December, it is raining for 10.9 days, with typically 3.19" (81mm) of accumulated precipitation.

How much does it snow in December?

In Bristol, during December, snow falls for 2.8 days and regularly aggregates up to 1.22" (31mm) 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 Bristol, the average day length in December is 9h and 23min.

What time are sunrise and sunset in December in Bristol?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:44 pm EST.

How many hours of sunshine does Bristol have in December?

In Bristol, the average sunshine duration in December is 5h.

When is the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes 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
Bristol, PA

Average temperature in December - Bristol, PA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (85.5°F).
The month with the lowest average high temperature is January (37°F).

  • Average low temperature in December: 32.4°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in December
Bristol, PA

Average pressure in December - Bristol, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Bristol, PA

Average wind speed in December - Bristol, PA
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Bristol, PA

Average humidity in December - Bristol, PA
  • Average humidity in December: 77%

The months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in December
Bristol, PA

Average rainfall in December - Bristol, PA
  • Average rainfall in December: 3.19"

The wettest month (with the highest rainfall) is July (3.66").
The driest month (with the least rainfall) is January (1.89").

Average rainfall days in December
Bristol, PA

Average rainfall days in December - Bristol, PA
  • Average rainfall days in December: 10.9 days

The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is January (8 days).

Average snowfall in December
Bristol, PA

Average snowfall in December - Bristol, PA
  • Average snowfall in December: 1.22"

The month with the highest snowfall is March (2.99").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Bristol, PA

Average snowfall days in December - Bristol, PA
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (4.8 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
Bristol, PA

Average daylight in December / Average sunshine in December - Bristol, 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 48min).

Average sunshine days in December
Bristol, PA

Average sunshine days in December - Bristol, PA
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.9 days).

Average UV index in December
Bristol, PA

Average UV index in December - Bristol, 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
Bristol, PA

Average cloud cover in December - Bristol, PA
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 32).

Average visibility in December
Bristol, PA

Average visibility in December - Bristol, 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).

Bristol, Pennsylvania, USA

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