December weather forecast
Narberth, PA

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Weather in December

December, the first month of the winter in Narberth, is still a chilly month, with temperature in the range of an average high of 43.2°F (6.2°C) and an average low of 32°F (0°C).

Temperature

The onset of December brings a small shift in high-temperatures, falling from a fresh 52°F (11.1°C) in November to a chilly 43.2°F (6.2°C). In the month of December, the nighttime temperature dips to a steady average of 32°F (0°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

In December, the rain falls for 6.5 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. In Narberth, during the entire year, the rain falls for 111.8 days and collects up to 9.69" (246mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Narberth, during December, snow falls for 2.1 days and regularly aggregates up to 0.63" (16mm) of snow. In Narberth, during the entire year, snow falls for 15.1 days and aggregates up to 3.66" (93mm) of snow.

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 December, the average sunshine is 4.9h.

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 value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

How cold is December?

In Narberth, in December, the average high-temperature is 43.2°F (6.2°C), and the average low-temperature is 32°F (0°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August 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 Narberth?

In December, the rain falls for 6.5 days. Throughout December, 0.91" (23mm) of precipitation is accumulated.

How much does it snow in Narberth in December?

In Narberth, in December, during 2.1 snowfall days, 0.63" (16mm) of snow is typically accumulated.

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 Narberth have 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 7:04 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 many hours of sunshine does Narberth have in December?

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

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 intensity in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to 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
Narberth, PA

Average temperature in December - Narberth, 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
Narberth, PA

Average pressure in December - Narberth, 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
Narberth, PA

Average wind speed in December - Narberth, 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
Narberth, PA

Average humidity in December - Narberth, 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
Narberth, PA

Average rainfall in December - Narberth, 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
Narberth, PA

Average rainfall days in December - Narberth, 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
Narberth, PA

Average snowfall in December - Narberth, 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
Narberth, PA

Average snowfall days in December - Narberth, 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
Narberth, PA

Average daylight in December / Average sunshine in December - Narberth, 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
Narberth, PA

Average sunshine days in December - Narberth, 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
Narberth, PA

Average UV index in December - Narberth, 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
Narberth, PA

Average cloud cover in December - Narberth, 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
Narberth, PA

Average visibility in December - Narberth, 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).

Narberth, Pennsylvania, USA

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