December weather forecast
Newtown Square, PA

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Weather in December

December, the first month of the winter in Newtown Square, is still a cold month, with an average temperature varying between 42.6°F (5.9°C) and 31.1°F (-0.5°C).

Temperature

December involves a decrease in temperature, down from a fresh 51.8°F (11°C) in November to a wintry 42.6°F (5.9°C). December witnesses an average nighttime temperature of 31.1°F (-0.5°C).

Humidity

In Newtown Square, the average relative humidity in December is 78%.

Rainfall

In December, the rain falls for 9.1 days. Throughout December, 1.81" (46mm) of precipitation is accumulated. Throughout the year, in Newtown Square, there are 138.1 rainfall days, and 20.79" (528mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Newtown Square, in December, snow falls for 2.5 days, with typically accumulated 1.46" (37mm) of snow. Throughout the year, there are 19.3 snowfall days, and 7.68" (195mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:46 pm EST.

Sunshine

In Newtown Square, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Updated: Jun 28, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

In Newtown Square, 42.6°F (5.9°C) is the average high-temperature and 31.1°F (-0.5°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 78%.

How much does it rain in December?

In Newtown Square, in December, it is raining for 9.1 days, with typically 1.81" (46mm) of accumulated precipitation.

How many days does it snow in December?

In Newtown Square, Pennsylvania, in December, snow falls for 2.5 days, with typically accumulated 1.46" (37mm) of snow.

What is the month with the shortest days in Newtown Square?

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?

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

What time are sunrise and 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 7:23 am and sunset at 4:46 pm EST.

How many hours of sunshine does Newtown Square have in December?

The average sunshine duration in December is 4.8h.

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?

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
Newtown Square, PA

Average temperature in December - Newtown Square, PA
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in December: 31.1°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Newtown Square, PA

Average pressure in December - Newtown Square, 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
Newtown Square, PA

Average wind speed in December - Newtown Square, PA
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

Average humidity in December
Newtown Square, PA

Average humidity in December - Newtown Square, PA
  • Average humidity in December: 78%

The months with the highest relative humidity are February and October (79%).
The months with the lowest relative humidity are April, July and August (73%).

Average rainfall in December
Newtown Square, PA

Average rainfall in December - Newtown Square, PA
  • Average rainfall in December: 1.81"

The wettest month (with the highest rainfall) is August (2.72").
The driest months (with the least rainfall) are January, February and November (1.3").

Average rainfall days in December
Newtown Square, PA

Average rainfall days in December - Newtown Square, PA
  • Average rainfall days in December: 9.1 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (6.3 days).

Average snowfall in December
Newtown Square, PA

Average snowfall in December - Newtown Square, PA
  • Average snowfall in December: 1.46"

The month with the highest snowfall is March (1.93").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Newtown Square, PA

Average snowfall days in December - Newtown Square, PA
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Newtown Square, PA

Average daylight in December / Average sunshine in December - Newtown Square, 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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Newtown Square, PA

Average sunshine days in December - Newtown Square, PA
  • Average sunshine days in December: 19.2 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is July (12.7 days).

Average UV index in December
Newtown Square, PA

Average UV index in December - Newtown Square, 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
Newtown Square, PA

Average cloud cover in December - Newtown Square, PA
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Newtown Square, PA

Average visibility in December - Newtown Square, 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).

Newtown Square, Pennsylvania, USA

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