December weather forecastSussex, NJ
December
Weather in December
December, the first month of the winter in Sussex, is also an icy month, with an average temperature varying between 26.8°F (-2.9°C) and 38.3°F (3.5°C).Temperature
Observing a mild shift, the average high-temperature during December reduces from November's chilly 48.4°F (9.1°C) to an icy 38.3°F (3.5°C). An average minimum temperature of 26.8°F (-2.9°C) is recorded during the month of December.Humidity
The months with the highest humidity are February, October and December, with an average relative humidity of 82%.Rainfall
In Sussex, in December, it is raining for 11.9 days, with typically 3.03" (77mm) of accumulated precipitation. In Sussex, New Jersey, during the entire year, the rain falls for 164.9 days and collects up to 31.89" (810mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Sussex. In Sussex, in December, during 6.4 snowfall days, 3.39" (86mm) of snow is typically accumulated. In Sussex, during the entire year, snow falls for 36.9 days and aggregates up to 19.84" (504mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.On the first day of the month, sunrise is at 7:05 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:39 pm EST.
Sunshine
In December, the average sunshine is 4.6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: In December, the UV index of 1 transforms into the following advice:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Sussex, NJ
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (32.7°F).
- Average low temperature in December: 26.8°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).
Average pressure in December
Sussex, 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
Sussex, NJ
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Sussex, 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
Sussex, NJ
- Average rainfall in December: 3.03"
The wettest month (with the highest rainfall) is May (3.19").
The driest month (with the least rainfall) is September (1.85").
Average rainfall days in December
Sussex, NJ
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is May (18.1 days).
The month with the least rainy days is January (8.7 days).
Average snowfall in December
Sussex, NJ
- Average snowfall in December: 3.39"
The month with the highest snowfall is February (5.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Sussex, NJ
- Average snowfall days in December: 6.4 days
The months with the highest number of snowfall days are January and February (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sussex, 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 36min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Sussex, NJ
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is April (10.4 days).
Average UV index in December
Sussex, NJ
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Sussex, 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 36).
Average visibility in December
Sussex, NJ
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
