December weather forecast
Ashbourne, PA

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Weather in December

The first month of the winter, December, is also a frosty month in Ashbourne, Pennsylvania, with an average temperature fluctuating between 42.8°F (6°C) and 31.6°F (-0.2°C).

Temperature

December suggests a modest reduction in the average high-temperature, shifting from a fresh 52.2°F (11.2°C) in November to a frosty 42.8°F (6°C). Nighttime temperature dips to a mean of 31.6°F (-0.2°C) during December.

Humidity

The months with the highest humidity are February, October and December, with an average relative humidity of 78%.

Rainfall

In Ashbourne, Pennsylvania, in December, it is raining for 7.5 days, with typically 1.14" (29mm) of accumulated precipitation. In Ashbourne, during the entire year, the rain falls for 122.4 days and collects up to 12.68" (322mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In Ashbourne, in December, snow falls for 2.5 days, with typically accumulated 0.71" (18mm) of snow. In Ashbourne, during the entire year, snow falls for 16.3 days and aggregates up to 4.72" (120mm) 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 7:03 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:45 pm EST.

Sunshine

In Ashbourne, the average sunshine in December is 5h.

UV index

January through March, 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 threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: An average UV index of 2 in December transforms into this advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Jun 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

During December, Ashbourne experiences an average high-temperature of 42.8°F (6°C) and a low-temperature of 31.6°F (-0.2°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is estimated at 89.6°F (32°C).

What are the most humid months?

The months with the highest humidity are February, October and December, with an average relative humidity of 78%.

What is the average humidity in December?

In December, the average relative humidity in Ashbourne, Pennsylvania, is 78%.

How many days does it rain in December?

In Ashbourne, Pennsylvania, during December, the rain falls for 7.5 days and regularly aggregates up to 1.14" (29mm) of precipitation.

How much does it snow in December?

In December, it is snowing for 2.5 days. Throughout December, 0.71" (18mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

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

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:35 pm. On the last day of the month, in Ashbourne, sunrise is at 7:22 am and sunset at 4:45 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 5h.

When is the lowest UV index?

January through March, 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 Ashbourne, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Ashbourne, PA

Average temperature in December - Ashbourne, PA
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (36.7°F).

  • Average low temperature in December: 31.6°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

Average pressure in December
Ashbourne, PA

Average pressure in December - Ashbourne, 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
Ashbourne, PA

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

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Ashbourne, PA

Average humidity in December - Ashbourne, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February, October and December (78%).
The months with the lowest relative humidity are April, July and August (72%).

Average rainfall in December
Ashbourne, PA

Average rainfall in December - Ashbourne, PA
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is August (1.54").
The driest month (with the least rainfall) is September (0.75").

Average rainfall days in December
Ashbourne, PA

Average rainfall days in December - Ashbourne, PA
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is November (6.4 days).

Average snowfall in December
Ashbourne, PA

Average snowfall in December - Ashbourne, PA
  • Average snowfall in December: 0.71"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Ashbourne, PA

Average snowfall days in December - Ashbourne, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (5.1 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
Ashbourne, PA

Average daylight in December / Average sunshine in December - Ashbourne, 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 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Ashbourne, PA

Average sunshine days in December - Ashbourne, PA
  • Average sunshine days in December: 20.9 days

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (14.4 days).

Average UV index in December
Ashbourne, PA

Average UV index in December - Ashbourne, 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, March, November and December (UV index 2).

Average cloud cover in December
Ashbourne, PA

Average cloud cover in December - Ashbourne, PA
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Ashbourne, PA

Average visibility in December - Ashbourne, 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).

Ashbourne, Pennsylvania, USA

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