December weather forecast
New Castle, DE

Weather in December

December, the first month of the winter in New Castle, is still a chilly month, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 44.1°F (6.7°C).

Temperature

In December, the average high-temperature decreases from a cool 53.2°F (11.8°C) in November to a frosty 44.1°F (6.7°C). In December, the average low-temperature is 32.9°F (0.5°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In New Castle, Delaware, in December, during 8.8 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 143.2 rainfall days, and 21.89" (556mm) of precipitation is accumulated.

Snowfall

January through April, November and December are months with snowfall. In New Castle, snow falls for 2.4 days, with typically accumulated 0.51" (13mm) of snow. Throughout the year, there are 15 snowfall days, and 5.47" (139mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature is 48.6°F (9.2°C).
Note: 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.

Daylight

December has the shortest days of the year, with an average of 9h and 25min of daylight.
On the first day of December in New Castle, sunrise is at 7:04 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:47 pm EST.

Sunshine

In New Castle, the average sunshine in December is 5.1h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in New Castle. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
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. 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. 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 New Castle?

The average relative humidity in December is 77%.

How many days does it rain in December in New Castle?

In New Castle, Delaware, during December, the rain falls for 8.8 days and regularly aggregates up to 1.85" (47mm) of precipitation.

How much does it snow in New Castle in December?

In December, it is snowing for 2.4 days. Throughout December, 0.51" (13mm) of snow is accumulated.

What is the ocean temperature in December in New Castle?

In New Castle, Delaware, the average seawater temperature in December is 48.6°F (9.2°C). 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.

What is the month with the shortest days in New Castle?

December has the shortest days of the year in New Castle, with an average of 9h and 25min of daylight.

How many hours of daylight does New Castle have in December?

In New Castle, the average day length in December is 9h and 25min.

When is the sunrise / sunset in December in New Castle?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:38 pm. On the last day of the month, in New Castle, Delaware, sunrise is at 7:22 am and sunset at 4:47 pm EST.

How long on average sun shines in December in New Castle?

In New Castle, the average sunshine duration in December is 5.1h.

When is the lowest UV index in New Castle?

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

How high is the UV index in December in New Castle?

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

Average temperature in December
New Castle, DE

Average temperature in December - New Castle, DE
  • Average high temperature in December: 44.1°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

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Average pressure in December
New Castle, DE

Average pressure in December - New Castle, DE
  • Average pressure in December: 30.1"Hg

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

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Average wind speed in December
New Castle, DE

Average wind speed in December - New Castle, DE
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in December
New Castle, DE

Average humidity in December - New Castle, 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
New Castle, DE

Average rainfall in December - New Castle, DE
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").

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Average rainfall days in December
New Castle, DE

Average rainfall days in December - New Castle, DE
  • Average rainfall days in December: 8.8 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in December
New Castle, DE

Average snowfall in December - New Castle, DE
  • Average snowfall in December: 0.51"

The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
New Castle, DE

Average snowfall days in December - New Castle, DE
  • Average snowfall days in December: 2.4 days

The month with the highest number of snowfall days is January (5.2 days).
The 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
New Castle, DE

Average sea temperature in December - New Castle, 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
New Castle, DE

Average daylight in December / Average sunshine in December - New Castle, DE
  • Average daylight in December: 9h and 25min

The month with the longest days is June (Average daylight: 14h and 56min).
The month with the shortest days is December (Average daylight: 9h and 25min).

  • Average sunshine in December: 5h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in December
New Castle, DE

Average sunshine days in December - New Castle, DE
  • Average sunshine days in December: 19.1 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in December
New Castle, DE

Average UV index in December - New Castle, 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, February, November and December (UV index 2).

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Average cloud cover in December
New Castle, DE

Average cloud cover in December - New Castle, DE
  • Average cloud cover in December: 45

The 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
New Castle, DE

Average visibility in December - New Castle, 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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