December weather forecast
Bethany Beach, DE

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Weather in December

As the last month of the year, December at Bethany Beach brings a winter chill, with an average low dropping to 40.1°F (4.5°C). An increase in snowfall with 0.2" (5mm) of snow provides a chance of a white Christmas. The winds are sharp and biting, reaching up to 14mph (22.5km/h), adding to the winter cold. Despite the chill, clear skies usually prevail due to a relatively stable atmospheric pressure of 30.1" (765mm). As the days shorten and the year draws to a close, festive lights brighten up the icy Bethany Beach nights.

Temperature

December's onset corresponds with a subtle shift in the average high-temperature, slightly moving from a fresh 55°F (12.8°C) in November to a frosty 47.8°F (8.8°C). Bethany Beach's nighttime temperature in December shows a minor descent, with a steady average of 40.1°F (4.5°C).

Humidity

The average relative humidity in December in Bethany Beach is 76%.

Rainfall

In Bethany Beach, in December, during 11.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated. In Bethany Beach, during the entire year, the rain falls for 147.8 days and collects up to 23.98" (609mm) of precipitation.

Snowfall

January through March and December are months with snowfall. December is the first month it typically snows in Bethany Beach. Throughout December, in the average 1.7 snowfall days, it receives 0.2" (5mm) of snow. In Bethany Beach, during the entire year, snow falls for 8.7 days and aggregates up to 1.54" (39mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 6:59 am and sunset at 4:39 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:49 pm EST.

Sunshine

In December, the average sunshine in Bethany Beach is 5.1h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Bethany Beach. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The UV index of 2 in December translates into these instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Stay sun-safe with clothing that is both closely woven and worn loosely. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
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Frequently asked questions

What are the temperatures in Bethany Beach in December?

In December, the average high-temperature and low-temperature in Bethany Beach, Delaware, are 47.8°F (8.8°C) and 40.1°F (4.5°C) respectively.

What is the average humidity in December in Bethany Beach?

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

How much does it rain in Bethany Beach in December?

In Bethany Beach, Delaware, during December, the rain falls for 11.1 days and regularly aggregates up to 1.81" (46mm) of precipitation.

When does it start to snow in Bethany Beach?

December is the first month it typically snows in Bethany Beach, Delaware. Throughout December, in the average 1.7 snowfall days, it receives 0.2" (5mm) of snow.

What is the month with the shortest days in Bethany Beach?

With an average of 9h and 30min of daylight, December has the shortest days of the year in Bethany Beach, Delaware.

What is the average length of the day in December in Bethany Beach?

In Bethany Beach, the average day length in December is 9h and 32min.

When is the sunrise / sunset in December in Bethany Beach?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:39 pm. On the last day of the month, in Bethany Beach, Delaware, sunrise is at 7:17 am and sunset at 4:49 pm EST.

How long on average sun shines in December in Bethany Beach?

In December, the average sunshine duration in Bethany Beach is 5.1h.

What is the month with the lowest UV index in Bethany Beach?

The months with the lowest UV index in Bethany Beach are January and December, with an average maximum UV index of 2.

How high is the UV index in December in Bethany Beach?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Bethany Beach, DE

Average temperature in December - Bethany Beach, DE
  • Average high temperature in December: 47.8°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (41.7°F).

  • Average low temperature in December: 40.1°F

The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).

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Average pressure in December
Bethany Beach, DE

Average pressure in December - Bethany Beach, DE
  • 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).

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Average wind speed in December
Bethany Beach, DE

Average wind speed in December - Bethany Beach, DE
  • Average wind speed in December: 13mph

The windiest month (with the highest average wind speed) is January (13.5mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).

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Average humidity in December
Bethany Beach, DE

Average humidity in December - Bethany Beach, DE
  • Average humidity in December: 76%

The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in December
Bethany Beach, DE

Average rainfall in December - Bethany Beach, DE
  • Average rainfall in December: 1.81"

The wettest month (with the highest rainfall) is August (2.68").
The driest month (with the least rainfall) is January (1.38").

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Average rainfall days in December
Bethany Beach, DE

Average rainfall days in December - Bethany Beach, DE
  • Average rainfall days in December: 11.1 days

The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is January (8.5 days).

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Average snowfall in December
Bethany Beach, DE

Average snowfall in December - Bethany Beach, DE
  • Average snowfall in December: 0.2"

The month with the highest snowfall is January (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Bethany Beach, DE

Average snowfall days in December - Bethany Beach, DE
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Bethany Beach, DE

Average daylight in December / Average sunshine in December - Bethany Beach, DE
  • 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 1min

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 0min).

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Average sunshine days in December
Bethany Beach, DE

Average sunshine days in December - Bethany Beach, DE
  • Average sunshine days in December: 16.3 days

The months with the most sunshine days are January and November (18.4 days).
The month with the least sunshine days is August (13.2 days).

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Average UV index in December
Bethany Beach, DE

Average UV index in December - Bethany Beach, DE
  • 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 and December (UV index 2).

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Average cloud cover in December
Bethany Beach, DE

Average cloud cover in December - Bethany Beach, DE
  • Average cloud cover in December: 45

The months with the most cloud cover are February, March and December (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).

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Average visibility in December
Bethany Beach, DE

Average visibility in December - Bethany Beach, DE
  • 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).

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Bethany Beach, Delaware, USA

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