December weather forecastClayton, DE
December
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
The onset of December entails a subtle temperature shift, as the average high-temperature eases from a fresh 54°F (12.2°C) in November to a chilly 45.9°F (7.7°C). Throughout December, Clayton anticipates an average low-temperature of 34.7°F (1.5°C).Humidity
In Clayton, the average relative humidity in December is 77%.Rainfall
In Clayton, in December, during 11.5 rainfall days, 3.43" (87mm) of precipitation is typically accumulated. Throughout the year, there are 169.2 rainfall days, and 34.96" (888mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Clayton, during December, snow falls for 2.5 days and regularly aggregates up to 0.91" (23mm) of snow. In Clayton, during the entire year, snow falls for 14.4 days and aggregates up to 7.44" (189mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.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, sunrise is at 7:22 am and sunset at 4:49 pm EST.
Sunshine
In December, the average sunshine is 5.2h.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 2 translates into these guidelines:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. To cut down UV radiation exposure by about half, sport a wide-brim hat. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in December /
Average sunshine in December
Clayton, DE
- Average daylight in December: 9h and 30min
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 12min
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).
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).
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).
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).
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).
