December weather forecast and climate
Selbyville, DE

Weather in December

December, the first month of the winter, in Selbyville, is also a frosty month, with average temperature fluctuating between 47.8°F (8.8°C) and 39.7°F (4.3°C).

Temperature

In December, the average high-temperature slightly decreases, from a fresh 55°F (12.8°C) in November, to a chilly 47.8°F (8.8°C). In Selbyville, the average low-temperature is 39.7°F (4.3°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In Selbyville, during December, the rain falls for 11.2 days and regularly aggregates up to 1.69" (43mm) of precipitation. Throughout the year, there are 144.6 rainfall days, and 25.51" (648mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Selbyville, Delaware, during December, snow falls for 1.7 days and regularly aggregates up to 0.35" (9mm) of snow. Throughout the year, there are 8.8 snowfall days, and 2.48" (63mm) of snow is accumulated.

Daylight

With an average of 9.5h of daylight, December has the shortest days of the year.

Sunshine

February and December, with an average of 5.1h of sunshine, are months with the least sunshine in Selbyville, Delaware.

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Selbyville?

In December, in Selbyville, the average high-temperature is 47.8°F (8.8°C), and the average low-temperature is 39.7°F (4.3°C).

What is the average humidity in December in Selbyville?

In December, the average relative humidity is 76%.

How many days does it rain in December in Selbyville?

In Selbyville, Delaware, during December, the rain falls for 11.2 days and regularly aggregates up to 1.69" (43mm) of precipitation.

How many days does it snow in December in Selbyville?

In Selbyville, in December, snow falls for 1.7 days, with typically accumulated 0.35" (9mm) of snow.

What is the month with the shortest days in Selbyville?

With an average of 9.5h of daylight, December has the shortest days of the year in Selbyville, Delaware.

How many hours of daylight does Selbyville have in December?

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

What is the month with the least sunshine in Selbyville?

February and December, with an average of 5.1h of sunshine, are months with the least sunshine in Selbyville.

How long on average sun shines in December in Selbyville?

The average sunshine in December in Selbyville is 5.1h.

When is the lowest UV index in Selbyville?

January 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 in Selbyville?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Selbyville, DE

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

The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (42.1°F).

  • Average low temperature in December: 39.7°F

The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (32.9°F).

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Average pressure in December
Selbyville, DE

Average pressure in December - Selbyville, 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").

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Average wind speed in December
Selbyville, DE

Average wind speed in December - Selbyville, DE
  • Average wind speed in December: 12.2mph

The windiest month (with the highest average wind speed) is January (12.8mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

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Average humidity in December
Selbyville, DE

Average humidity in December - Selbyville, DE
  • Average humidity in December: 76%

The month with the highest relative humidity is May (82%).
Months with the lowest relative humidity are January and November (74%).

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Average rainfall in December
Selbyville, DE

Average rainfall in December - Selbyville, DE
  • Average rainfall in December: 1.69"

The wettest months (with the highest rainfall) are July and August (2.87").
The driest month (with the least rainfall) is January (1.5").

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Average rainfall days in December
Selbyville, DE

Average rainfall days in December - Selbyville, DE
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (7.4 days).

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Average snowfall in December
Selbyville, DE

Average snowfall in December - Selbyville, DE
  • Average snowfall in December: 0.35"

The month with the highest snowfall is February (0.87").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Selbyville, DE

Average snowfall days in December - Selbyville, DE
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is January (2.6 days).
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
Selbyville, DE

Average daylight in December / Average sunshine in December - Selbyville, 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).
Months with the least sunshine are February and December (Average sunshine: 5.1).

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Average sunshine days in December
Selbyville, DE

Average sunshine days in December - Selbyville, DE
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is January (19.7 days).
The month with the least sunshine days is July (12.9 days).

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Average UV index in December
Selbyville, DE

Average UV index in December - Selbyville, 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).

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Average cloud cover in December
Selbyville, DE

Average cloud cover in December - Selbyville, DE
  • Average cloud cover in December: 45

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 26).

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Average visibility in December
Selbyville, DE

Average visibility in December - Selbyville, 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).

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