December weather forecast
Bethlehem, MD

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Weather in December

The first month of the winter, December, is still a chilly month in Bethlehem, Maryland, with an average temperature fluctuating between 46.8°F (8.2°C) and 36.1°F (2.3°C).

Temperature

The onset of December is marked by a minor decrease in temperature, transitioning from a cool 54.5°F (12.5°C) in November to a frosty 46.8°F (8.2°C). Throughout the month of December, Bethlehem reports a steady low-temperature average of 36.1°F (2.3°C).

Humidity

In Bethlehem, the average relative humidity in December is 76%.

Rainfall

In Bethlehem, in December, during 8.6 rainfall days, 1.02" (26mm) of precipitation is typically accumulated. Throughout the year, there are 130 rainfall days, and 15.04" (382mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Bethlehem, during December, snow falls for 1.5 days and regularly aggregates up to 0.43" (11mm) of snow. In Bethlehem, during the entire year, snow falls for 9.4 days and aggregates up to 1.85" (47mm) of snow.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:52 pm EST.

Sunshine

In Bethlehem, the average sunshine in December is 5.3h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 2 during December translates into the following guidance:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.

Frequently asked questions

What is the usual temperature for Bethlehem in December?

An average high-temperature, in December, in Bethlehem, is 46.8°F (8.2°C) and the average low-temperature is 36.1°F (2.3°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), 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 December, the average relative humidity in Bethlehem is 76%.

How many days does it rain in December?

In December, the rain falls for 8.6 days. Throughout December, 1.02" (26mm) of precipitation is accumulated.

How many days does it snow in December?

In Bethlehem, in December, during 1.5 snowfall days, 0.43" (11mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

How many hours of daylight does Bethlehem have in December?

The average day length in December is 9h and 31min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:42 pm. On the last day of the month, in Bethlehem, sunrise is at 7:21 am and sunset at 4:52 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 5.3h.

When is the lowest UV index?

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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
Bethlehem, MD

Average temperature in December - Bethlehem, MD
  • Average high temperature in December: 46.8°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in December: 36.1°F

The month with the highest average low temperature is July (70.9°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).

Average pressure in December
Bethlehem, MD

Average pressure in December - Bethlehem, MD
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Bethlehem, MD

Average wind speed in December - Bethlehem, MD
  • Average wind speed in December: 8.9mph

The windiest months (with the highest average wind speed) are February and March (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

Average humidity in December
Bethlehem, MD

Average humidity in December - Bethlehem, MD
  • Average humidity in December: 76%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January and November (73%).

Average rainfall in December
Bethlehem, MD

Average rainfall in December - Bethlehem, MD
  • Average rainfall in December: 1.02"

The wettest month (with the highest rainfall) is August (1.93").
The driest month (with the least rainfall) is January (0.75").

Average rainfall days in December
Bethlehem, MD

Average rainfall days in December - Bethlehem, MD
  • Average rainfall days in December: 8.6 days

The month with the highest number of rainy days is July (14.9 days).
The month with the least rainy days is February (7.4 days).

Average snowfall in December
Bethlehem, MD

Average snowfall in December - Bethlehem, MD
  • Average snowfall in December: 0.43"

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

Average snowfall days in December
Bethlehem, MD

Average snowfall days in December - Bethlehem, MD
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Bethlehem, MD
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).

Average sunshine days in December
Bethlehem, MD

Average sunshine days in December - Bethlehem, MD
  • Average sunshine days in December: 20.1 days

The month with the most sunshine days is November (21 days).
The month with the least sunshine days is August (13 days).

Average UV index in December
Bethlehem, MD

Average UV index in December - Bethlehem, MD
  • 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 and December (UV index 2).

Average cloud cover in December
Bethlehem, MD

Average cloud cover in December - Bethlehem, MD
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

Average visibility in December
Bethlehem, MD

Average visibility in December - Bethlehem, MD
  • Average visibility in December: 6mi

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

Bethlehem, Maryland, USA

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