December weather forecastSewell, NJ
December
Weather in December
The first month of the winter, December, is still a chilly month in Sewell, New Jersey, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 44.1°F (6.7°C).Temperature
The onset of December is marked by a decrease in temperature, transitioning from a fresh 53.2°F (11.8°C) in November to a chilly 44.1°F (6.7°C). December nights are marked by an average temperature drop to an icy 32.9°F (0.5°C).Humidity
The months with the highest humidity are October and December, with an average relative humidity of 77%.Rainfall
In December, the rain falls for 7.1 days. Throughout December, 0.91" (23mm) of precipitation is accumulated. In Sewell, during the entire year, the rain falls for 113.4 days and collects up to 9.25" (235mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Sewell, in December, during 1.7 snowfall days, 0.12" (3mm) of snow is typically accumulated. Throughout the year, there are 10.9 snowfall days, and 1.65" (42mm) of snow is accumulated.Daylight
With an average of 9h and 24min 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 4:36 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:46 pm EST.
Sunshine
The average sunshine in December is 5.1h.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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In December, a regular UV index of 2 translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sewell, NJ
- Average high temperature in December: 44.1°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in December: 32.9°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).
Average pressure in December
Sewell, NJ
- Average pressure in December: 30.09"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
Sewell, NJ
- Average wind speed in December: 7.8mph
The windiest months (with the highest average wind speed) are March and April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).
Average humidity in December
Sewell, NJ
- Average humidity in December: 77%
The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is April (71%).
Average rainfall in December
Sewell, NJ
- Average rainfall in December: 0.91"
The wettest month (with the highest rainfall) is August (1.1").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Sewell, NJ
- Average rainfall days in December: 7.1 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is November (6.3 days).
Average snowfall in December
Sewell, NJ
- Average snowfall in December: 0.12"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Sewell, NJ
- Average snowfall days in December: 1.7 days
The month with the highest number of snowfall days is January (3.5 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
Sewell, NJ
- Average daylight in December: 9h and 24min
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 6min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).
Average sunshine days in December
Sewell, NJ
- Average sunshine days in December: 22 days
The month with the most sunshine days is November (22.5 days).
The month with the least sunshine days is July (14.7 days).
Average UV index in December
Sewell, NJ
- 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
Sewell, NJ
- Average cloud cover in December: 45
The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 29).
Average visibility in December
Sewell, NJ
- 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).
