December weather forecast
Claymont, DE

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Weather in December

December brings the arrival of winter with lower average temperatures ranging from

32.7°F (0.4°C) up to 43.7°F (6.5°C). Among the most notable shifts from November is the increase of snowfall reaching 1.54" (39mm) throughout the month. Despite the cold weather, Claymont enjoys a fair share of sunshine, with average 5 hours of sunshine per day. The wind speed increases to 8mph (12.9km/h), adding a chill to the air. December embraces the colder temperatures, resultant snow, and festive atmosphere of the holiday season.

Temperature

December's onset brings a negligible change in high-temperatures, falling from a fresh 52.2°F (11.2°C) in November to a chilly 43.7°F (6.5°C). Claymont temperatures generally rest at a low of 32.7°F (0.4°C) during the December nights.

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Claymont, in December, during 11.5 rainfall days, 3.31" (84mm) of precipitation is typically accumulated. Throughout the year, there are 168.9 rainfall days, and 35.55" (903mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Claymont are January through May, October through December. In Claymont, in December, snow falls for 3.2 days, with typically accumulated 1.54" (39mm) of snow. In Claymont, during the entire year, snow falls for 21.9 days and aggregates up to 12.05" (306mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:47 pm EST.

Sunshine

The average sunshine in December is 5h.

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 value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. To guard against the harmful effects of the Sun, minimize exposure during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

Frequently asked questions

How cold does it get in December?

In December, the average high-temperature and low-temperature are 43.7°F (6.5°C) and 32.7°F (0.4°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is estimated at 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 77%.

How many days does it rain in December?

In Claymont, in December, during 11.5 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Claymont, during December, snow falls for 3.2 days and regularly aggregates up to 1.54" (39mm) of snow.

What is the month with the shortest days?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Claymont, Delaware, the average day length in December is 9h and 25min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:47 pm EST.

How many hours of sunshine does Claymont have in December?

The average sunshine duration in December is 5h.

What are the months with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health 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
Claymont, DE

Average temperature in December - Claymont, DE
  • Average high temperature in December: 43.7°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°F).

  • Average low temperature in December: 32.7°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 (25.3°F).

Average pressure in December
Claymont, DE

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

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Claymont, DE

Average wind speed in December - Claymont, DE
  • Average wind speed in December: 8mph

The windiest months (with the highest average wind speed) are January, February and March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in December
Claymont, DE

Average humidity in December - Claymont, 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%).

Average rainfall in December
Claymont, DE

Average rainfall in December - Claymont, DE
  • Average rainfall in December: 3.31"

The wettest month (with the highest rainfall) is August (4.09").
The driest month (with the least rainfall) is January (2.36").

Average rainfall days in December
Claymont, DE

Average rainfall days in December - Claymont, DE
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Claymont, DE

Average snowfall in December - Claymont, DE
  • Average snowfall in December: 1.54"

The month with the highest snowfall is March (3.58").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Claymont, DE

Average snowfall days in December - Claymont, DE
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Claymont, DE
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in December
Claymont, DE

Average sunshine days in December - Claymont, DE
  • Average sunshine days in December: 15.9 days

The month with the most sunshine days is November (18.6 days).
The months with the least sunshine days are May and July (9.8 days).

Average UV index in December
Claymont, DE

Average UV index in December - Claymont, 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).

Average cloud cover in December
Claymont, DE

Average cloud cover in December - Claymont, DE
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Claymont, DE

Average visibility in December - Claymont, 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).

Claymont, Delaware, USA

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