December weather forecast
Coplay, PA

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Weather in December

The first month of the winter, December, is still a cold month in Coplay, Pennsylvania, with an average temperature varying between 40.1°F (4.5°C) and 28.9°F (-1.7°C).

Temperature

A moderate decline in the average high-temperature is seen during December, decreasing from a frosty 49.1°F (9.5°C) in November to a cold 40.1°F (4.5°C). In Coplay, an average low-temperature of 28.9°F (-1.7°C) is recorded during December nights.

Humidity

In December, the average relative humidity is 80%.

Rainfall

In December, the rain falls for 12.1 days. Throughout December, 2.87" (73mm) of precipitation is accumulated. Throughout the year, in Coplay, there are 162.5 rainfall days, and 31.69" (805mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Coplay, during December, snow falls for 5.5 days and regularly aggregates up to 2.95" (75mm) of snow. In Coplay, during the entire year, snow falls for 32.3 days and aggregates up to 17.24" (438mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:07 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:44 pm EST.

Sunshine

In Coplay, Pennsylvania, the average sunshine in December is 4.7h.

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 hazard from exposure to the Sun's UV rays for average individuals.
Note: The UV index of 2 during December translates into the following guidance:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.

Frequently asked questions

How cold does it get in December?

In December, in Coplay, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.9°F (-1.7°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which represents the influence of relative humidity on air temperature, is evaluated at 86°F (30°C).

What is the average humidity in December?

In Coplay, the average relative humidity in December is 80%.

How many days does it rain in December?

In December, the rain falls for 12.1 days. Throughout December, 2.87" (73mm) of precipitation is accumulated.

How many days does it snow in December?

In Coplay, during December, snow falls for 5.5 days and regularly aggregates up to 2.95" (75mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

How many hours of daylight does Coplay have in December?

In Coplay, Pennsylvania, the average day length in December is 9h and 19min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:35 pm. On the last day of the month, in Coplay, sunrise is at 7:25 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration in Coplay is 4.7h.

What are the months 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.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to 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
Coplay, PA

Average temperature in December - Coplay, PA
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in December: 28.9°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

Average pressure in December
Coplay, PA

Average pressure in December - Coplay, 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
Coplay, PA

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

The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Coplay, PA

Average humidity in December - Coplay, PA
  • Average humidity in December: 80%

The month with the highest relative humidity is February (81%).
The months with the lowest relative humidity are April and July (76%).

Average rainfall in December
Coplay, PA

Average rainfall in December - Coplay, PA
  • Average rainfall in December: 2.87"

The wettest month (with the highest rainfall) is July (3.19").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in December
Coplay, PA

Average rainfall days in December - Coplay, PA
  • Average rainfall days in December: 12.1 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (9.9 days).

Average snowfall in December
Coplay, PA

Average snowfall in December - Coplay, PA
  • Average snowfall in December: 2.95"

The month with the highest snowfall is March (4.88").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Coplay, PA

Average snowfall days in December - Coplay, PA
  • Average snowfall days in December: 5.5 days

The month with the highest number of snowfall days is February (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Coplay, 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 18min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Coplay, PA

Average sunshine days in December - Coplay, PA
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (11.7 days).

Average UV index in December
Coplay, PA

Average UV index in December - Coplay, PA
  • Average UV index in December: 2

The months with the highest UV index are June and July (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
Coplay, PA

Average cloud cover in December - Coplay, PA
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Coplay, PA

Average visibility in December - Coplay, PA
  • Average visibility in December: 5mi

The months with the highest visibility are April and November (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (5mi).

Coplay, Pennsylvania, USA

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