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 sea temperature 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
In December, the average high-temperature marginally drops from a cool 52.3°F (11.3°C) in November to a chilly 43.5°F (6.4°C). In the month of December, the average temperature in Keyport dips to a wintry 34.2°F (1.2°C) during the night.Humidity
The average relative humidity in December is 76%.Rainfall
In Keyport, during December, the rain falls for 10.7 days and regularly aggregates up to 2.8" (71mm) of precipitation. In Keyport, during the entire year, the rain falls for 153 days and collects up to 28.7" (729mm) of precipitation.Snowfall
Months with snowfall in Keyport are January through April, November and December. In Keyport, during December, snow falls for 3.1 days and regularly aggregates up to 0.83" (21mm) of snow. Throughout the year, there are 16.9 snowfall days, and 6.34" (161mm) of snow is accumulated.Ocean temperature
In December, the average ocean temperature in Keyport, New Jersey, is 48°F (8.9°C).Note: You can swim in 48°F (8.9°C) below 50°F (10°C) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 55.4°F (13°C) without it is tough.
Daylight
December has the shortest days of the year, with an average of 9h and 18min of daylight.On the first day of December, sunrise is at 7:01 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:40 pm EST.
Sunshine
The average sunshine in December is 5h.UV index
The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum UV index of 2 during December leads to these instructions:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Frequently asked questions
Is it cold in Keyport during December?
What is the average humidity in December in Keyport?
How many days does it rain in December in Keyport?
How much does it snow in Keyport in December?
What is the water temperature in December in Keyport?
What is the month with the shortest days in Keyport?
How many hours of daylight does Keyport have in December?
When are sunrise and sunset in December in Keyport?
How long on average sun shines in December in Keyport?
What is the month with the lowest UV index in Keyport?
What is the UV index intensity in December in Keyport?
Average temperature in December
Keyport, NJ
- Average high temperature in December: 43.5°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 (37°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Keyport, 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
Keyport, NJ
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in December
Keyport, NJ
- Average humidity in December: 76%
The months with the highest relative humidity are May and June (77%).
The months with the lowest relative humidity are March, April, August and November (73%).
Average rainfall in December
Keyport, NJ
- Average rainfall in December: 2.8"
The wettest month (with the highest rainfall) is July (3.43").
The driest month (with the least rainfall) is January (1.61").
Average rainfall days in December
Keyport, NJ
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is January (8.2 days).
Average snowfall in December
Keyport, NJ
- Average snowfall in December: 0.83"
The month with the highest snowfall is March (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Keyport, NJ
- Average snowfall days in December: 3.1 days
The month with the highest number of snowfall days is January (5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in December
Keyport, NJ
- Average sea temperature in December: 48.1°F
The best month for swimming (with the highest average sea temperature) is August (74.8°F).
The coldest month (with the lowest average sea temperature) is February (40.4°F).
Average daylight in December /
Average sunshine in December
Keyport, NJ
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in December
Keyport, NJ
- Average sunshine days in December: 17.5 days
The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (11.5 days).
Average UV index in December
Keyport, 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
Keyport, NJ
- Average cloud cover in December: 47
The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 30).
Average visibility in December
Keyport, 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).
Keyport, New Jersey, USA
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