December weather forecastDelaware, NJ
December
Weather in December
The first month of the winter, December, is still a cold month in Delaware, New Jersey, with an average temperature ranging between min 26.8°F (-2.9°C) and max 38.3°F (3.5°C).Temperature
Delaware's progression into December includes a drop in the average high-temperature, from a frosty 47.8°F (8.8°C) in November to a cold 38.3°F (3.5°C). In the month of December, Delaware experiences an average low-temperature of 26.8°F (-2.9°C).Humidity
The months with the highest humidity in Delaware are February, October and December, with an average relative humidity of 82%.Rainfall
In Delaware, New Jersey, during December, the rain falls for 12.6 days and regularly aggregates up to 3.03" (77mm) of precipitation. Throughout the year, in Delaware, there are 165.9 rainfall days, and 31.61" (803mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Delaware, New Jersey. In Delaware, during December, snow falls for 7.5 days and regularly aggregates up to 3.39" (86mm) of snow. Throughout the year, in Delaware, there are 42.7 snowfall days, and 21.26" (540mm) of snow is accumulated.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Delaware.On the first day of the month, sunrise is at 7:06 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:42 pm EST.
Sunshine
The average sunshine in December in Delaware is 4.7h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index in Delaware. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily high UV index of 1 during December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Delaware, NJ
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (61.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Delaware, NJ
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Delaware, NJ
- Average wind speed in December: 7.1mph
The windiest months (with the highest average wind speed) are January, February and March (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Delaware, NJ
- Average humidity in December: 82%
The months with the highest relative humidity are February, October and December (82%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
Delaware, NJ
- Average rainfall in December: 3.03"
The wettest month (with the highest rainfall) is July (3.11").
The driest month (with the least rainfall) is September (1.81").
Average rainfall days in December
Delaware, NJ
- Average rainfall days in December: 12.6 days
The month with the highest number of rainy days is July (17.4 days).
The month with the least rainy days is February (9.5 days).
Average snowfall in December
Delaware, NJ
- Average snowfall in December: 3.39"
The month with the highest snowfall is February (5.67").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Delaware, NJ
- Average snowfall days in December: 7.5 days
The month with the highest number of snowfall days is January (11.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Delaware, NJ
- Average daylight in December: 9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 4h and 42min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).
Average sunshine days in December
Delaware, NJ
- Average sunshine days in December: 14.5 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is June (11.1 days).
Average UV index in December
Delaware, NJ
- Average UV index in December: 1
The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Delaware, NJ
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in December
Delaware, NJ
- Average visibility in December: 5mi
The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).
