December weather forecast
Clayton, DE

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Weather in December

December, bound by winter’s grasp, sees a further drop in temperatures, with lower boundaries reaching 34.7°F (1.5°C) in Clayton, Delaware. Milder snowfall enriches the land, painting a snowy end-of-the-year landscape. While lower temperatures persist, a significant increase in rainfall to 3.43" (87mm) is observed compared to November. The year concludes with shorter days and extended nights, owing to the reduced 9.5 hours of daylight. The strong winds, reaching up to 8.7mph (14km/h), contribute to the winter chill that marks this festive time.

Temperature

December is characterized by a mild reduction in the average high-temperature, from a cool 54°F (12.2°C) in November to a chilly 45.9°F (7.7°C). During December, Clayton records an average temperature of 34.7°F (1.5°C) at night.

Humidity

The average relative humidity in December is 77%.

Rainfall

In Clayton, in December, it is raining for 11.5 days, with typically 3.43" (87mm) of accumulated precipitation. Throughout the year, in Clayton, there are 169.2 rainfall days, and 34.96" (888mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Clayton, Delaware, are January through April, November and December. In Clayton, in December, during 2.5 snowfall days, 0.91" (23mm) of snow is typically accumulated. Throughout the year, in Clayton, Delaware, there are 14.4 snowfall days, and 7.44" (189mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:39 pm. On the last day of December, in Clayton, sunrise is at 7:22 am and sunset at 4:49 pm EST.

Sunshine

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

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. When the Sun is at its strongest around midday, find shade and limit exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
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Frequently asked questions

What are the temperatures in Clayton in December?

The average high-temperature and low-temperature in Clayton, Delaware, during December are 45.9°F (7.7°C) and 34.7°F (1.5°C) respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines air temperature and relative humidity, is evaluated at 89.6°F (32°C).

What is the average humidity in December in Clayton?

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

How many days does it rain in December in Clayton?

In December, in Clayton, Delaware, the rain falls for 11.5 days. Throughout December, 3.43" (87mm) of precipitation is accumulated.

How much does it snow in Clayton in December?

In December, in Clayton, Delaware, it is snowing for 2.5 days. Throughout December, 0.91" (23mm) of snow is accumulated.

What is the month with the shortest days in Clayton?

With an average of 9h and 30min of daylight, December has the shortest days of the year in Clayton, Delaware.

What is the average length of the day in December in Clayton?

The average day length in December is 9h and 28min.

When is the sunrise / sunset in December in Clayton?

On the first day of December in Clayton, Delaware, sunrise is at 7:03 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:49 pm EST.

How long on average sun shines in December in Clayton?

In December, the average sunshine duration in Clayton is 5.2h.

What are the months with the lowest UV index in Clayton?

The months with the lowest UV index in Clayton, Delaware, are January and December, with an average maximum UV index of 2.

How high is the UV index in December in Clayton?

In December, the average daily maximum UV index in Clayton, Delaware, is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASONDecember
Nov
December
Jan
Average high temperature
54°F 12.2°C
45.9°F 7.7°C
39.2°F 4°C
Average low temperature
41.2°F 5.1°C
34.7°F 1.5°C
27.9°F -2.3°C
Average pressure
30.12" 765mmHg
30.1" 765mmHg
30.09" 764mmHg
Average wind speed
8.5mph 13.7km/h
8.7mph 14km/h
9.4mph 15.1km/h
Average max. wind speed
9.3mph 15km/h
9.4mph 15.1km/h
10.1mph 16.3km/h
Average wind speed gusts
14.2mph 22.9km/h
14.3mph 23km/h
15.3mph 24.6km/h
Average humidity
74%
77%
74%
Average rainfall
2.28" 58mm
3.43" 87mm
2.13" 54mm
Average rainfall days
9.3
11.5
9.7
Average snowfall
0.28" 7mm
0.91" 23mm
2.09" 53mm
Average snowfall days
0.3
2.5
4.5
Average daylight
10h 0min
9h 3min
9h 5min
Average sunshine
5h 5min
5h 1min
5h 2min
Average sunshine days
19.5
16.8
17.2
Average UV index
3
2
2
Average cloud cover
35%
44%
43%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in December
Clayton, DE

Average temperature in December - Clayton, DE
  • Average high temperature in December: 45.9°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (39.2°F).

  • Average low temperature in December: 34.7°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (27.9°F).

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Average pressure in December
Clayton, DE

Average pressure in December - Clayton, 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).

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Average wind speed in December
Clayton, DE

Average wind speed in December - Clayton, DE
  • Average wind speed in December: 8.7mph

The windiest months (with the highest average wind speed) are February and March (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in December
Clayton, DE

Average humidity in December - Clayton, DE
  • Average humidity in December: 77%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in December
Clayton, DE

Average rainfall in December - Clayton, DE
  • Average rainfall in December: 3.43"

The wettest month (with the highest rainfall) is August (3.86").
The driest month (with the least rainfall) is January (2.13").

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Average rainfall days in December
Clayton, DE

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

The month with the highest number of rainy days is July (19 days).
The month with the least rainy days is November (9.3 days).

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Average snowfall in December
Clayton, DE

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

The month with the highest snowfall is March (2.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Clayton, DE

Average snowfall days in December - Clayton, DE
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (4.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Clayton, DE
  • Average daylight in December: 9h and 3min

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 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

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Average sunshine days in December
Clayton, DE

Average sunshine days in December - Clayton, DE
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (9.5 days).

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Average UV index in December
Clayton, DE

Average UV index in December - Clayton, 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 and December (UV index 2).

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Average cloud cover in December
Clayton, DE

Average cloud cover in December - Clayton, DE
  • Average cloud cover in December: 44

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 29).

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Average visibility in December
Clayton, DE

Average visibility in December - Clayton, 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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Clayton, Delaware, USA

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