December weather forecast and climate
South Bethany, DE

The first month of the winter, December, is still a chilly month in South Bethany, Delaware, with temperature in the range of an average low of 40.1°F (4.5°C) and an average high of 47.8°F (8.8°C).

Temperature

In December, the average high-temperature marginally drops, from a fresh 55°F (12.8°C) in November, to a chilly 47.8°F (8.8°C). The average low-temperature, in South Bethany, is 40.1°F (4.5°C).

Humidity

The average relative humidity in South Bethany, Delaware, is 76%.

Rainfall

In South Bethany, during December, the rain falls for 11.1 days and regularly aggregates up to 1.81" (46mm) of precipitation. Throughout the year, there are 147.8 rainfall days, and 23.98" (609mm) of precipitation is accumulated.

Snowfall

January through March and December are months with snowfall. December is the first month it typically snows in South Bethany. Throughout December, in the average 1.7 snowfall days, it receives 0.2" (5mm) of snow. In South Bethany, 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 in South Bethany is December, with an average of 9.5h of daylight.

Sunshine

In South Bethany, the average sunshine is 5.1h.

UV index

Months with the lowest UV index in South Bethany are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in South Bethany?

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

What is the average humidity in December in South Bethany?

In December, the average relative humidity is 76%.

How much does it rain in South Bethany in December?

In South Bethany, Delaware, in December, during 11.1 rainfall days, 1.81" (46mm) of precipitation is typically accumulated.

When does it start snowing in South Bethany?

December is the first month it typically snows. 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 South Bethany?

December has the shortest days of the year in South Bethany, Delaware, with an average of 9.5h of daylight.

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

In December, the average length of the day is 9.5h.

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

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

What are the months with the lowest UV index in South Bethany?

Months with the lowest UV index in South Bethany, Delaware, are January and December, with an average maximum UV index of 2.

What is the UV index intensity in December in South Bethany?

In South Bethany, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - South Bethany, 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).

Average pressure in December - South Bethany, DE
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

Average wind speed in December - South Bethany, 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).

Average humidity in December - South Bethany, 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%).

Average rainfall in December - South Bethany, 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").

Average rainfall days in December - South Bethany, 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).

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

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

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

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

Average daylight in December / Average sunshine in December - South Bethany, DE
  • Average daylight in December: 9.5h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 10.9h).
The month with the least sunshine is February (Average sunshine: 5h).

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

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).

Average UV index in December - South Bethany, DE
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

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

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).

Average visibility in December - South Bethany, DE
  • Average visibility in December: 6mi

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