December weather forecast
Perkiomen Junction, PA

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Weather in December

December, the first month of the winter in Perkiomen Junction, is still a cold month, with an average temperature varying between 30.9°F (-0.6°C) and 42.3°F (5.7°C).

Temperature

With the arrival of December, Perkiomen Junction experiences a modest decline in average high-temperatures, transitioning from a cool 51.1°F (10.6°C) in November to a cold 42.3°F (5.7°C). In December, Perkiomen Junction experiences an average nighttime temperature of 30.9°F (-0.6°C).

Humidity

The average relative humidity in December is 79%.

Rainfall

In December, the rain falls for 7.9 days. Throughout December, 0.98" (25mm) of precipitation is accumulated. In Perkiomen Junction, during the entire year, the rain falls for 132.3 days and collects up to 13.98" (355mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Perkiomen Junction. In Perkiomen Junction, in December, during 2.5 snowfall days, 0.51" (13mm) of snow is typically accumulated. Throughout the year, there are 15.1 snowfall days, and 2.2" (56mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:05 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

The average sunshine in December is 4.8h.

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 minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Updated: Jul 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

December temperatures vary between a high-temperature of 42.3°F (5.7°C) and a low-temperature of 30.9°F (-0.6°C). The average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

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

How much does it rain in December?

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

How many days does it snow in December in Perkiomen Junction?

In Perkiomen Junction, 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?

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

How many hours of daylight does Perkiomen Junction have in December?

The average day length in December in Perkiomen Junction is 9h and 23min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:36 pm. On the last day of the month, in Perkiomen Junction, sunrise is at 7:23 am and sunset at 4:46 pm EST.

How many hours of sunshine does Perkiomen Junction have in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index in Perkiomen Junction?

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

What is the UV index reading in December?

In Perkiomen Junction, the average daily maximum UV index in December is 2. A UV Index 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
Perkiomen Junction, PA

Average temperature in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average pressure in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average wind speed in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average humidity in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average rainfall in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average rainfall days in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average snowfall in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average snowfall days in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average daylight in December / Average sunshine in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average sunshine days in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average UV index in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average cloud cover in December - Perkiomen Junction, 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
Perkiomen Junction, PA

Average visibility in December - Perkiomen Junction, 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).

Perkiomen Junction, Pennsylvania, USA

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