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 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 start of December involves a temperature drop, moving from a frosty 48.4°F (9.1°C) in November to an icy 38.3°F (3.5°C). An average low-temperature of 26.8°F (-2.9°C) is observed during the December nights.Humidity
The months with the highest humidity are February, October and December, with an average relative humidity of 82%.Rainfall
In December, the rain falls for 11.9 days. Throughout December, 3.03" (77mm) of precipitation is accumulated. In Sussex, during the entire year, the rain falls for 164.9 days and collects up to 31.89" (810mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Sussex, in December, during 6.4 snowfall days, 3.39" (86mm) of snow is typically accumulated. In Sussex, New Jersey, during the entire year, snow falls for 36.9 days and aggregates up to 19.84" (504mm) of snow.Daylight
With an average of 9h and 18min of daylight, December has the shortest days of the year in Sussex, New Jersey.On the first day of December in Sussex, sunrise is at 7:05 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:39 pm EST.
Sunshine
The average sunshine in December in Sussex is 4.6h.UV index
December is the month with the lowest UV index, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.Note: An average maximum UV index of 1 in December leads to these recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
How cold is December in Sussex?
What is the most humid month in Sussex?
What is the average humidity in December in Sussex?
How many days does it rain in December in Sussex?
How many days does it snow in December in Sussex?
What is the month with the shortest days in Sussex?
What is the average length of the day in December in Sussex?
When is the sunrise / sunset in December in Sussex?
How long on average sun shines in December in Sussex?
What is the month with the lowest UV index in Sussex?
How high is the UV index in December in Sussex?
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 2min
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 4min
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).
Sussex, New Jersey, USA
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