December weather forecast and climate
Lewes, DE

Weather in December

The first month of the winter, December, is also a frosty month in Lewes, Delaware, with average temperature ranging between max 46.9°F (8.3°C) and min 39.2°F (4°C).

Temperature

In Lewes, the average high-temperature in December slightly decreases, from a fresh 54.5°F (12.5°C) in November, to a frosty 46.9°F (8.3°C). In December, the average low-temperature is 39.2°F (4°C).

Humidity

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

Rainfall

In December, the rain falls for 11.9 days. Throughout December, 3.07" (78mm) of precipitation is accumulated. Throughout the year, there are 173.6 rainfall days, and 36.97" (939mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Lewes, during December, snow falls for 1.2 days and regularly aggregates up to 0.91" (23mm) of snow. In Lewes, during the entire year, snow falls for 10.1 days, and aggregates up to 3.39" (86mm) of snow.

Ocean temperature

In Lewes, the average seawater temperature is 48.7°F (9.3°C).
Note: Swimming in 48.7°F (9.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The month with the shortest days in Lewes is December, with an average of 9.5h of daylight.

Sunshine

In December, the average sunshine is 5.2h.

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Lewes?

The average relative humidity in December in Lewes, Delaware, is 76%.

How many days does it rain in December in Lewes?

In Lewes, in December, it is raining for 11.9 days, with typically 3.07" (78mm) of accumulated precipitation.

How many days does it snow in December in Lewes?

In Lewes, in December, snow falls for 1.2 days, with typically accumulated 0.91" (23mm) of snow.

What is the ocean temperature in December in Lewes?

In December, the average ocean temperature in Lewes, Delaware, is 48.7°F (9.3°C). Swimming in 48.7°F (9.3°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Lewes?

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

How many hours of daylight does Lewes have in December?

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

How many hours of sunshine does Lewes have in December?

In Lewes, the average sunshine in December is 5.2h.

What is the month with the lowest UV index in Lewes?

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

How high is the UV index in December in Lewes?

In Lewes, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Lewes, DE

Average temperature in December - Lewes, DE
  • Average high temperature in December: 46.9°F

The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in December: 39.2°F

The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (32°F).

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Average pressure in December
Lewes, DE

Average pressure in December - Lewes, 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
Lewes, DE

Average wind speed in December - Lewes, DE
  • Average wind speed in December: 11.9mph

The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).

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Average humidity in December
Lewes, DE

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

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in December
Lewes, DE

Average rainfall in December - Lewes, DE
  • Average rainfall in December: 3.07"

The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.2").

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Average rainfall days in December
Lewes, DE

Average rainfall days in December - Lewes, DE
  • Average rainfall days in December: 11.9 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is January (9.6 days).

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Average snowfall in December
Lewes, DE

Average snowfall in December - Lewes, DE
  • Average snowfall in December: 0.91"

The month with the highest snowfall is January (0.98").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Lewes, DE

Average snowfall days in December - Lewes, DE
  • Average snowfall days in December: 1.2 days

The month with the highest number of snowfall days is January (3.7 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average sea temperature in December
Lewes, DE

Average sea temperature in December - Lewes, DE
  • Average sea temperature in December: 48.8°F

The best month for swimming (with the highest average sea temperature) is August (76.9°F).
The coldest month (with the lowest average sea temperature) is February (40.7°F).

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Average daylight in December /
Average sunshine in December
Lewes, DE

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

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in December: 5.2h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is February (Average sunshine: 5h).

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Average sunshine days in December
Lewes, DE

Average sunshine days in December - Lewes, DE
  • Average sunshine days in December: 16.3 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (9.8 days).

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Average UV index in December
Lewes, DE

Average UV index in December - Lewes, 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
Lewes, DE

Average cloud cover in December - Lewes, DE
  • Average cloud cover in December: 43

Months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).

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Average visibility in December
Lewes, DE

Average visibility in December - Lewes, 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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