December weather forecast
Delaware City, DE

Weather in December

The first month of the winter, December, is also a frosty month in Delaware City, Delaware, with an average temperature varying between 44.4°F (6.9°C) and 33.3°F (0.7°C).

Temperature

In December, the average high-temperature drops from a cool 53.4°F (11.9°C) in November to a chilly 44.4°F (6.9°C). In December, the average low-temperature is 33.3°F (0.7°C).

Humidity

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

Rainfall

In December, in Delaware City, the rain falls for 9.6 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. In Delaware City, 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 December, it is snowing for 2.1 days. Throughout December, 0.35" (9mm) of snow is accumulated. 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, 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

The month with the shortest days in Delaware City, Delaware, is December, with an average of 9h and 26min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:38 pm. On the last day of December, in Delaware City, sunrise is at 7:22 am and sunset at 4:48 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

The 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 low health risk from unsafe exposure to UV radiation for average individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always 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 temperature in December in Delaware City?

In December, in Delaware City, Delaware, the average high-temperature is 44.4°F (6.9°C), and the average low-temperature is 33.3°F (0.7°C). in August, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 91.4°F (33°C).

What is the average humidity in December in Delaware City?

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

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

In Delaware City, in December, it is raining for 9.6 days, with typically 2.17" (55mm) of accumulated precipitation.

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

In Delaware City, Delaware, in December, during 2.1 snowfall days, 0.35" (9mm) of snow is typically accumulated.

How cold is the water in December in Delaware City?

In Delaware City, Delaware, in December, the average water temperature 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 Delaware City?

The month with the shortest days in Delaware City, Delaware, is December, with an average of 9h and 26min of daylight.

What is the average length of the day in December in Delaware City?

The average day length in December in Delaware City is 9h and 26min.

When is the sunrise / sunset in December in Delaware City?

On the first day of December in Delaware City, sunrise is at 7:03 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:48 pm EST.

How long on average sun shines in December in Delaware City?

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

What are the months with 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.

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

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation.
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
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"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
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").
The 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).
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
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: 9h and 26min

The month with the longest days is June (Average daylight: 14h and 55min).
The month with the shortest days is December (Average daylight: 9h and 26min).

  • Average sunshine in December: 5h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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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

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
Delaware City, DE

Average cloud cover in December - Delaware City, 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
Delaware City, DE

Average visibility in December - Delaware City, 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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