December weather forecastSouth Dennis, NJ
December
Weather in December
The first month of the winter, December, is also a frosty month in South Dennis, New Jersey, with an average temperature ranging between max 46°F (7.8°C) and min 37.9°F (3.3°C).Temperature
South Dennis's progression into December involves a minor drop in the average high-temperature, slightly receding from a fresh 54.1°F (12.3°C) in November to a frosty 46°F (7.8°C). December nights witness a slight temperature decrease, averaging at a cold 37.9°F (3.3°C).Humidity
The average relative humidity in December is 76%.Rainfall
In South Dennis, during December, the rain falls for 9.8 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, there are 130.8 rainfall days, and 13.23" (336mm) of precipitation is accumulated.Snowfall
January through March, November and December are months with snowfall. In South Dennis, in December, snow falls for 2.5 days, with typically accumulated 0.47" (12mm) of snow. In South Dennis, during the entire year, snow falls for 13.2 days and aggregates up to 1.85" (47mm) 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 7:00 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:46 pm EST.
Sunshine
The average sunshine in December is 5.2h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: The daily high UV index of 2 in December translates into this advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
South Dennis, NJ
- Average high temperature in December: 46°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in December: 37.9°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in December
South Dennis, NJ
- Average pressure in December: 30.09"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
South Dennis, NJ
- Average wind speed in December: 11.4mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).
Average humidity in December
South Dennis, NJ
- 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
South Dennis, NJ
- Average rainfall in December: 1.06"
The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in December
South Dennis, NJ
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (7 days).
Average snowfall in December
South Dennis, NJ
- Average snowfall in December: 0.47"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in December
South Dennis, NJ
- Average snowfall days in December: 2.5 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
South Dennis, NJ
- 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: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in December
South Dennis, NJ
- Average sunshine days in December: 18.1 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (13.4 days).
Average UV index in December
South Dennis, NJ
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
South Dennis, NJ
- Average cloud cover in December: 44
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in December
South Dennis, 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).
