Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average sea temperature in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The onset of December results in a small decrease in the average high-temperature, moderately receding from a fresh 54.5°F (12.5°C) in November to a frosty 46.9°F (8.3°C). December nights reveal a minor deviation from daytime highs, with a mean low-temperature of 39.2°F (4°C).Humidity
The average relative humidity in December is 76%.Rainfall
In Lewes, Delaware, in December, it is raining for 11.9 days, with typically 3.07" (78mm) of accumulated precipitation. Throughout the year, there are 173.6 rainfall days, and 36.97" (939mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March, November and December. In Lewes, in December, snow falls for 1.2 days, with typically accumulated 0.91" (23mm) of snow. Throughout the year, there are 10.1 snowfall days, and 3.39" (86mm) of snow is accumulated.Ocean temperature
In December, the average ocean temperature is 48.7°F (9.3°C).Note: In 48.7°F (9.3°C), cold shock and rapid breathing can occur when swimming at temperatures below 50°F (10°C).
Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:00 am and sunset at 4:39 pm. On the last day of December, in Lewes, sunrise is at 7:18 am and sunset at 4:49 pm EST.
Sunshine
In Lewes, the average sunshine in December 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 reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average December temperature?
What is the average humidity in December?
How much does it rain in Lewes in December?
How much does it snow in December?
What is the water temperature in December?
What is the month with the shortest days in Lewes?
How many hours of daylight does Lewes have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does Lewes have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Lewes, DE
- Average high temperature in December: 46.9°F
The warmest month (with the highest average high temperature) is July (80.6°F).
The month with the lowest average high temperature is January (41.2°F).
- Average low temperature in December: 39.2°F
The month with the highest average low temperature is July (73°F).
The coldest month (with the lowest average low temperature) is January (32°F).
Average pressure in December
Lewes, 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
Lewes, DE
- Average wind speed in December: 11.9mph
The windiest month (with the highest average wind speed) is January (12.5mph).
The calmest month (with the lowest average wind speed) is August (8.3mph).
Average humidity in December
Lewes, DE
- Average humidity in December: 76%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).
Average rainfall in December
Lewes, DE
- Average rainfall in December: 3.07"
The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is January (2.2").
Average rainfall days in December
Lewes, DE
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is January (9.6 days).
Average snowfall in December
Lewes, DE
- Average snowfall in December: 0.91"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
Lewes, DE
- Average snowfall days in December: 1.2 days
The month with the highest number of snowfall days is January (3.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in December
Lewes, DE
- Average sea temperature in December: 48.8°F
The best month for swimming (with the highest average sea temperature) is August (76.9°F).
The coldest month (with the lowest average sea temperature) is February (40.7°F).
Average daylight in December /
Average sunshine in December
Lewes, DE
- Average daylight in December: 9h and 3min
The month with the longest days is June (Average daylight: 14h and 48min).
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: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in December
Lewes, DE
- Average sunshine days in December: 16.3 days
The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is May (9.8 days).
Average UV index in December
Lewes, 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
Lewes, DE
- Average cloud cover in December: 43
The months with the most cloud cover are February and March (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in December
Lewes, 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).
Lewes, Delaware, USA
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