December weather forecast
Roelofs, PA

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Weather in December

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

Temperature

A modest decline in the average high-temperature is seen during December, decreasing from a fresh 52.3°F (11.3°C) in November to a chilly 43.7°F (6.5°C). Roelofs's nights in December experience an average temperature drop to a cold 32.4°F (0.2°C).

Humidity

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

Rainfall

In Roelofs, during December, the rain falls for 10.9 days and regularly aggregates up to 3.19" (81mm) of precipitation. In Roelofs, Pennsylvania, 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 Roelofs, in December, snow falls for 2.8 days, with typically accumulated 1.22" (31mm) of snow. Throughout the year, in Roelofs, 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 7:03 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:43 pm EST.

Sunshine

In December, the average sunshine 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 value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the average person.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
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. To guard against the harmful effects of the Sun, minimize exposure during midday. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

In December, the average high-temperature and low-temperature are 43.7°F (6.5°C) and 32.4°F (0.2°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, is appraised at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How many days does it rain in December?

In Roelofs, 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 Roelofs, in December, during 2.8 snowfall days, 1.22" (31mm) of snow is typically 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 December, the average day length is 9h and 22min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:03 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:43 pm EST.

How many hours of sunshine does Roelofs have in December?

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 Roelofs, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents 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
Roelofs, PA

Average temperature in December - Roelofs, 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
Roelofs, PA

Average pressure in December - Roelofs, 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
Roelofs, PA

Average wind speed in December - Roelofs, 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
Roelofs, PA

Average humidity in December - Roelofs, 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
Roelofs, PA

Average rainfall in December - Roelofs, 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
Roelofs, PA

Average rainfall days in December - Roelofs, 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
Roelofs, PA

Average snowfall in December - Roelofs, 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
Roelofs, PA

Average snowfall days in December - Roelofs, 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
Roelofs, PA

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

Average sunshine days in December - Roelofs, 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
Roelofs, PA

Average UV index in December - Roelofs, 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
Roelofs, PA

Average cloud cover in December - Roelofs, 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
Roelofs, PA

Average visibility in December - Roelofs, 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).

Roelofs, Pennsylvania, USA

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