December weather forecast
Coopersburg, PA

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Weather in December

December, the first month of the winter in Coopersburg, is still a cold month, with an average temperature varying between 41.5°F (5.3°C) and 29.8°F (-1.2°C).

Temperature

In Coopersburg, the beginning of December is marked by a marginally lowered average high-temperature, shifting from November's fresh 50.4°F (10.2°C) to a cold 41.5°F (5.3°C). An average minimum temperature of 29.8°F (-1.2°C) is recorded during the month of December.

Humidity

In December, the average relative humidity is 80%.

Rainfall

In December, the rain falls for 10 days. Throughout December, 2.91" (74mm) of precipitation is accumulated. In Coopersburg, during the entire year, the rain falls for 154.1 days and collects up to 31.73" (806mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Coopersburg, during December, snow falls for 5 days and regularly aggregates up to 2.87" (73mm) of snow. Throughout the year, there are 29.3 snowfall days, and 16.57" (421mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:44 pm EST.

Sunshine

In Coopersburg, 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 minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Be prepared! The intensity of the Sun's UV radiation can be amplified nearly double due to snow reflection.

Frequently asked questions

How cold does it get in December?

The high-temperature, in December, in Coopersburg, records 41.5°F (5.3°C), while the low-temperature is 29.8°F (-1.2°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines relative humidity and air temperature, in August is computed to be 89.6°F (32°C).

What is the average humidity in December?

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

How much does it rain in December?

In Coopersburg, during December, the rain falls for 10 days and regularly aggregates up to 2.91" (74mm) of precipitation.

How many days does it snow in December?

In Coopersburg, in December, snow falls for 5 days, with typically accumulated 2.87" (73mm) of snow.

What is the month with the shortest days?

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

How many hours of daylight does Coopersburg have in December?

In Coopersburg, the average day length in December is 9h and 20min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:35 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:44 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.8h.

When is the lowest UV index in Coopersburg?

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 reading of 2, and below, represents a minimal hazard to health 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
Coopersburg, PA

Average temperature in December - Coopersburg, PA
  • Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

Average pressure in December
Coopersburg, PA

Average pressure in December - Coopersburg, 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
Coopersburg, PA

Average wind speed in December - Coopersburg, PA
  • Average wind speed in December: 7.5mph

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

Average humidity in December
Coopersburg, PA

Average humidity in December - Coopersburg, 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 (75%).

Average rainfall in December
Coopersburg, PA

Average rainfall in December - Coopersburg, PA
  • Average rainfall in December: 2.91"

The wettest months (with the highest rainfall) are May and July (3.07").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in December
Coopersburg, PA

Average rainfall days in December - Coopersburg, PA
  • Average rainfall days in December: 10 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in December
Coopersburg, PA

Average snowfall in December - Coopersburg, PA
  • Average snowfall in December: 2.87"

The month with the highest snowfall is March (4.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Coopersburg, PA

Average snowfall days in December - Coopersburg, PA
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is February (8.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

Average sunshine days in December - Coopersburg, PA
  • Average sunshine days in December: 17 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is June (11.8 days).

Average UV index in December
Coopersburg, PA

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

The months with the highest UV index are May, 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
Coopersburg, PA

Average cloud cover in December - Coopersburg, PA
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Coopersburg, PA

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

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

Coopersburg, Pennsylvania, USA

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