December weather forecast
Bethlehem, PA

A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania
A tranquil setting of dry trees and neat fields behind this large hall in the Lehigh University in Bethlehem, Pennsylvania

Weather in December

December, the first month of the winter in Bethlehem, is still a cold month, with an average temperature ranging between min 28.8°F (-1.8°C) and max 40.1°F (4.5°C).

Temperature

In Bethlehem, the average high-temperature in December decreases from a cool 50°F (10°C) in November to a cold 40.1°F (4.5°C). In Bethlehem, the average low-temperature is 28.8°F (-1.8°C).

Humidity

The average relative humidity in December in Bethlehem is 80%.

Rainfall

In Bethlehem, during December, the rain falls for 10.7 days and regularly aggregates up to 2.24" (57mm) of precipitation. In Bethlehem, during the entire year, the rain falls for 153 days and collects up to 26.81" (681mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Bethlehem. In Bethlehem, in December, snow falls for 4.8 days, with typically accumulated 2.48" (63mm) of snow. Throughout the year, in Bethlehem, there are 26.7 snowfall days, and 14.49" (368mm) of snow is accumulated.

Daylight

With an average of 9h and 19min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:35 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:43 pm EST.

Sunshine

In Bethlehem, 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 in Bethlehem. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 2 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Bethlehem?

In December, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.8°F (-1.8°C). in August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is appraised at 86°F (30°C).

What is the average humidity in December in Bethlehem?

The average relative humidity in December in Bethlehem, Pennsylvania, is 80%.

How many days does it rain in December in Bethlehem?

In Bethlehem, Pennsylvania, during December, the rain falls for 10.7 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How much does it snow in Bethlehem in December?

In Bethlehem, Pennsylvania, in December, during 4.8 snowfall days, 2.48" (63mm) of snow is typically accumulated.

What is the month with the shortest days in Bethlehem?

December has the shortest days of the year in Bethlehem, with an average of 9h and 19min of daylight.

How many hours of daylight does Bethlehem have in December?

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

When is the sunrise / sunset in December in Bethlehem?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:35 pm. On the last day of the month, in Bethlehem, sunrise is at 7:24 am and sunset at 4:43 pm EST.

How long on average sun shines in December in Bethlehem?

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

When is the lowest UV index in Bethlehem?

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

How high is the UV index in December in Bethlehem?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to Sun's UV rays.
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
Bethlehem, PA

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

The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in December: 28.8°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

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Average pressure in December
Bethlehem, PA

Average pressure in December - Bethlehem, 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).

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Average wind speed in December
Bethlehem, PA

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

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).

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Average humidity in December
Bethlehem, PA

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

The month with the highest relative humidity is February (82%).
The months with the lowest relative humidity are April and July (76%).

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Average rainfall in December
Bethlehem, PA

Average rainfall in December - Bethlehem, PA
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is July (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in December
Bethlehem, PA

Average rainfall days in December - Bethlehem, PA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in December
Bethlehem, PA

Average snowfall in December - Bethlehem, PA
  • Average snowfall in December: 2.48"

The month with the highest snowfall is March (4.13").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Bethlehem, PA

Average snowfall days in December - Bethlehem, PA
  • Average snowfall days in December: 4.8 days

The months with the highest number of snowfall days are January and February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Bethlehem, PA
  • Average daylight in December: 9h and 19min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in December: 4h and 42min

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).

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Average sunshine days in December
Bethlehem, PA

Average sunshine days in December - Bethlehem, PA
  • Average sunshine days in December: 17.2 days

The month with the most sunshine days is November (18.9 days).
The month with the least sunshine days is May (11 days).

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Average UV index in December
Bethlehem, PA

Average UV index in December - Bethlehem, 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).

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Average cloud cover in December
Bethlehem, PA

Average cloud cover in December - Bethlehem, 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 34).

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Average visibility in December
Bethlehem, PA

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

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

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