December weather forecast
Wilmer, PA

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Weather in December

December, the first month of the winter in Wilmer, is also a wintry month, with an average temperature ranging between max 42.3°F (5.7°C) and min 30.9°F (-0.6°C).

Temperature

A moderate decline in average high-temperatures is noted in December, moving from a cool 51.1°F (10.6°C) in November to a cold 42.3°F (5.7°C). Wilmer's December nights cool down to an average low-temperature of 30.9°F (-0.6°C).

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Wilmer, during December, the rain falls for 7.9 days and regularly aggregates up to 0.98" (25mm) of precipitation. Throughout the year, there are 132.3 rainfall days, and 13.98" (355mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Wilmer, Pennsylvania, in December, during 2.5 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Wilmer, during the entire year, snow falls for 15.1 days and aggregates up to 2.2" (56mm) 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 7:05 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.

Sunshine

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 of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: During December, 2 as the daily maximum UV index converts into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Boost your sun resistance with garments that are densely woven yet spacious. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

An average high-temperature, in December, in Wilmer, is 42.3°F (5.7°C) and the average low-temperature is 30.9°F (-0.6°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, is estimated at 89.6°F (32°C).

What is the average humidity in December?

In Wilmer, the average relative humidity in December is 79%.

How much does it rain in December?

In Wilmer, in December, during 7.9 rainfall days, 0.98" (25mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Wilmer, Pennsylvania, during December, snow falls for 2.5 days and regularly aggregates up to 0.51" (13mm) of snow.

What is the month with the shortest days?

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?

The average day length in December is 9h and 22min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:46 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.8h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Wilmer, PA

Average temperature in December - Wilmer, PA
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in December
Wilmer, PA

Average pressure in December - Wilmer, PA
  • Average pressure in December: 30.1"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
Wilmer, PA

Average wind speed in December - Wilmer, PA
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Wilmer, PA

Average humidity in December - Wilmer, PA
  • Average humidity in December: 79%

The month with the highest relative humidity is February (80%).
The months with the lowest relative humidity are April and July (74%).

Average rainfall in December
Wilmer, PA

Average rainfall in December - Wilmer, PA
  • Average rainfall in December: 0.98"

The wettest month (with the highest rainfall) is August (1.77").
The driest month (with the least rainfall) is February (0.75").

Average rainfall days in December
Wilmer, PA

Average rainfall days in December - Wilmer, PA
  • Average rainfall days in December: 7.9 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (6.9 days).

Average snowfall in December
Wilmer, PA

Average snowfall in December - Wilmer, PA
  • Average snowfall in December: 0.51"

The months with the highest snowfall are January and February (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Wilmer, PA

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

The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Wilmer, PA

Average daylight in December / Average sunshine in December - Wilmer, 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 36min).

Average sunshine days in December
Wilmer, PA

Average sunshine days in December - Wilmer, PA
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is June (12.8 days).

Average UV index in December
Wilmer, PA

Average UV index in December - Wilmer, 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
Wilmer, PA

Average cloud cover in December - Wilmer, 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
Wilmer, PA

Average visibility in December - Wilmer, 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).

Wilmer, Pennsylvania, USA

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