December weather forecast and climate
Delaware City, DE

Weather in December

December, the first month of the winter, in Delaware City, is still a chilly month, with average temperature ranging between max 44.4°F (6.9°C) and min 33.3°F (0.7°C).

Temperature

In December, the average high-temperature decreases, from a fresh 53.4°F (11.9°C) in November, to a frosty 44.4°F (6.9°C). In Delaware City, Delaware,, the average low-temperature is 33.3°F (0.7°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Delaware City, Delaware, during December, the rain falls for 9.6 days and regularly aggregates up to 2.17" (55mm) of precipitation. In Delaware City, Delaware, during the entire year, the rain falls for 145.9 days and collects up to 24.45" (621mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Delaware City, during December, snow falls for 2.1 days and regularly aggregates up to 0.35" (9mm) of snow. In Delaware City, during the entire year, snow falls for 13 days, and aggregates up to 5.24" (133mm) of snow.

Ocean temperature

In Delaware City, in December, the average water temperature is 48.6°F (9.2°C).
Note: Swimming in 48.6°F (9.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 9.4h of daylight, December has the shortest days of the year in Delaware City, Delaware.

Sunshine

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

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 2 transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Delaware City?

In Delaware City, Delaware, the average relative humidity in December is 77%.

How much does it rain in Delaware City in December?

In Delaware City, in December, during 9.6 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

How many days does it snow in December in Delaware City?

In Delaware City, Delaware, in December, snow falls for 2.1 days, with typically accumulated 0.35" (9mm) of snow.

What is the water temperature in December in Delaware City?

In December, the average ocean temperature in Delaware City is 48.6°F (9.2°C). Swimming in 48.6°F (9.2°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 Delaware City?

December has the shortest days of the year in Delaware City, with an average of 9.4h of daylight.

How many hours of daylight does Delaware City have in December?

In December, the average length of the day is 9.4h.

How many hours of sunshine does Delaware City have in December?

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

When is the lowest UV index in Delaware City?

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

What is the UV index intensity in December in Delaware City?

In December, the average daily maximum UV index in Delaware City is 2. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.

Average temperature in December
Delaware City, DE

Average temperature in December - Delaware City, DE
  • Average high temperature in December: 44.4°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in December: 33.3°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

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Average pressure in December
Delaware City, DE

Average pressure in December - Delaware City, DE
  • Average pressure in December: 30.1"

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

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Average wind speed in December
Delaware City, DE

Average wind speed in December - Delaware City, DE
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in December
Delaware City, DE

Average humidity in December - Delaware City, DE
  • Average humidity in December: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Delaware City, DE

Average rainfall in December - Delaware City, DE
  • Average rainfall in December: 2.17"

The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.54").

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Average rainfall days in December
Delaware City, DE

Average rainfall days in December - Delaware City, DE
  • Average rainfall days in December: 9.6 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in December
Delaware City, DE

Average snowfall in December - Delaware City, DE
  • Average snowfall in December: 0.35"

The month with the highest snowfall is January (1.65").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Delaware City, DE

Average snowfall days in December - Delaware City, DE
  • Average snowfall days in December: 2.1 days

The month with the highest number of snowfall days is January (4.3 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in December
Delaware City, DE

Average sea temperature in December - Delaware City, DE
  • Average sea temperature in December: 48.5°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

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Average daylight in December /
Average sunshine in December
Delaware City, DE

Average daylight in December / Average sunshine in December - Delaware City, DE
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in December
Delaware City, DE

Average sunshine days in December - Delaware City, DE
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in December
Delaware City, DE

Average UV index in December - Delaware City, 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, February, November and December (UV index 2).

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Average cloud cover in December
Delaware City, DE

Average cloud cover in December - Delaware City, DE
  • Average cloud cover in December: 45

Months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in December
Delaware City, DE

Average visibility in December - Delaware City, 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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