December weather forecast and climate
Rockaway, NJ

Weather in December

December, the first month of the winter, in Rockaway, is still a cold month, with temperature in the range of an average high of 40.1°F (4.5°C) and an average low of 28.6°F (-1.9°C).

Temperature

In December, the average high-temperature drops, from a frosty 49.3°F (9.6°C) in November, to a wintry 40.1°F (4.5°C). In Rockaway, New Jersey, in December, the average low-temperature is 28.6°F (-1.9°C).

Humidity

Months with the highest humidity are February, October and December, with an average relative humidity of 81%.

Rainfall

In Rockaway, during December, the rain falls for 5.5 days and regularly aggregates up to 0.71" (18mm) of precipitation. In Rockaway, during the entire year, the rain falls for 81.9 days and collects up to 6.69" (170mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Rockaway, New Jersey. In Rockaway, during December, snow falls for 2.5 days and regularly aggregates up to 0.47" (12mm) of snow. Throughout the year, there are 18.1 snowfall days, and 2.68" (68mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature in Rockaway is 46.8°F (8.2°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year, with an average of 9.3h of daylight.

Sunshine

In December, the average sunshine is 4.7h.

UV index

Months with the lowest UV index in Rockaway 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 health risk from the exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in December in Rockaway?

In Rockaway, in December, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.6°F (-1.9°C).

What is the most humid month in Rockaway?

February, October and December, with an average relative humidity of 81%, are most humid months in Rockaway, New Jersey.

What is the average humidity in December in Rockaway?

The average relative humidity in December in Rockaway, New Jersey, is 81%.

How many days does it rain in December in Rockaway?

In Rockaway, during December, the rain falls for 5.5 days and regularly aggregates up to 0.71" (18mm) of precipitation.

How many days does it snow in December in Rockaway?

In Rockaway, in December, snow falls for 2.5 days, with typically accumulated 0.47" (12mm) of snow.

How cold is the water in December in Rockaway?

In Rockaway, the average seawater temperature in December is 46.8°F (8.2°C). Swimming in 46.8°F (8.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Rockaway?

The month with the shortest days in Rockaway is December, with an average of 9.3h of daylight.

How many hours of daylight does Rockaway have in December?

In December, the average length of the day is 9.3h.

How long on average sun shines in December in Rockaway?

In December, the average sunshine in Rockaway, New Jersey, is 4.7h.

When is the lowest UV index in Rockaway?

Months with the lowest UV index in Rockaway are January through March, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Rockaway?

The average daily maximum UV index in December in Rockaway, New Jersey, is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Rockaway, NJ

Average temperature in December - Rockaway, NJ
  • Average high temperature in December: 40.1°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (34.3°F).

  • Average low temperature in December: 28.6°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (20.8°F).

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Average pressure in December
Rockaway, NJ

Average pressure in December - Rockaway, NJ
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Rockaway, NJ

Average wind speed in December - Rockaway, NJ
  • Average wind speed in December: 7.4mph

The windiest month (with the highest average wind speed) is March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

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Average humidity in December
Rockaway, NJ

Average humidity in December - Rockaway, NJ
  • Average humidity in December: 81%

Months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in December
Rockaway, NJ

Average rainfall in December - Rockaway, NJ
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is July (0.79").
The driest month (with the least rainfall) is September (0.16").

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Average rainfall days in December
Rockaway, NJ

Average rainfall days in December - Rockaway, NJ
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is July (9.5 days).
The month with the least rainy days is February (4 days).

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Average snowfall in December
Rockaway, NJ

Average snowfall in December - Rockaway, NJ
  • Average snowfall in December: 0.47"

The month with the highest snowfall is March (0.79").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Rockaway, NJ

Average snowfall days in December - Rockaway, NJ
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is February (5.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in December
Rockaway, NJ

Average sea temperature in December - Rockaway, NJ
  • Average sea temperature in December: 46.6°F

The best month for swimming (with the highest average sea temperature) is August (74.4°F).
The coldest month (with the lowest average sea temperature) is February (39.3°F).

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Average daylight in December /
Average sunshine in December
Rockaway, NJ

Average daylight in December / Average sunshine in December - Rockaway, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 4.7h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.4h).

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Average sunshine days in December
Rockaway, NJ

Average sunshine days in December - Rockaway, NJ
  • Average sunshine days in December: 24.1 days

The month with the most sunshine days is November (24.5 days).
The month with the least sunshine days is July (18.3 days).

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Average UV index in December
Rockaway, NJ

Average UV index in December - Rockaway, NJ
  • Average UV index in December: 2

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in December
Rockaway, NJ

Average cloud cover in December - Rockaway, NJ
  • Average cloud cover in December: 50

Months with the most cloud cover are February and March (Cloud cover 51).
Months with the least cloud cover are July and August (Cloud cover 36).

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Average visibility in December
Rockaway, NJ

Average visibility in December - Rockaway, NJ
  • Average visibility in December: 6mi

Months with the highest visibility are January, March, April, November and December (6mi).
Months with the lowest visibility are February, May, June, July, August, September and October (5mi).

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