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 onset of December introduces a moderate change in Cedar Knolls's weather, with average high-temperatures falling from November's fresh 50.5°F (10.3°C) to a wintry 40.8°F (4.9°C). December nights in Cedar Knolls experience a consistent temperature drop to a subzero cold 29.5°F (-1.4°C).Humidity
The months with the highest humidity in Cedar Knolls, New Jersey, are February, October and December, with an average relative humidity of 80%.Rainfall
In Cedar Knolls, during December, the rain falls for 10.9 days and regularly aggregates up to 2.4" (61mm) of precipitation. Throughout the year, in Cedar Knolls, there are 157.9 rainfall days, and 27.05" (687mm) of precipitation is accumulated.Snowfall
January through May, November and December are months with snowfall. In Cedar Knolls, in December, during 3.8 snowfall days, 1.06" (27mm) of snow is typically accumulated. Throughout the year, there are 24 snowfall days, and 9.72" (247mm) of snow is accumulated.Daylight
With an average of 9h and 18min 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 4:30 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:40 pm EST.
Sunshine
In December, the average sunshine is 4.8h.UV index
The months with the lowest UV index in Cedar Knolls are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 2 in December transforms into this advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
Is it cold in Cedar Knolls during December?
What is the most humid month in Cedar Knolls?
What is the average humidity in December in Cedar Knolls?
How much does it rain in Cedar Knolls in December?
How many days does it snow in December in Cedar Knolls?
What is the month with the shortest days in Cedar Knolls?
How many hours of daylight does Cedar Knolls have in December?
When are sunrise and sunset in December in Cedar Knolls?
How many hours of sunshine does Cedar Knolls have in December?
What is the month with the lowest UV index in Cedar Knolls?
What is the UV index intensity in December in Cedar Knolls?
Average temperature in December
Cedar Knolls, NJ
- Average high temperature in December: 40.8°F
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (34.9°F).
- Average low temperature in December: 29.5°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure in December
Cedar Knolls, 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
Cedar Knolls, NJ
- Average wind speed in December: 7.6mph
The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Cedar Knolls, NJ
- Average humidity in December: 80%
The months with the highest relative humidity are February, October and December (80%).
The month with the lowest relative humidity is April (74%).
Average rainfall in December
Cedar Knolls, NJ
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is July (3.19").
The driest months (with the least rainfall) are January, February and September (1.57").
Average rainfall days in December
Cedar Knolls, NJ
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in December
Cedar Knolls, NJ
- Average snowfall in December: 1.06"
The month with the highest snowfall is March (3.7").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Cedar Knolls, NJ
- Average snowfall days in December: 3.8 days
The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Cedar Knolls, 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 5min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).
Average sunshine days in December
Cedar Knolls, NJ
- Average sunshine days in December: 16.8 days
The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Cedar Knolls, 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, March, November and December (UV index 2).
Average cloud cover in December
Cedar Knolls, NJ
- Average cloud cover in December: 49
The months with the most cloud cover are February, March and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 34).
Average visibility in December
Cedar Knolls, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, July, August, October, November and December (6mi).
The months with the lowest visibility are May, June and September (5mi).
Cedar Knolls, New Jersey, USA
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