December weather forecast and climate
Rockaway, NJ

The first month of the winter, December, is still a cold month in Rockaway, New Jersey, with average temperature fluctuating between 28.6°F (-1.9°C) and 40.1°F (4.5°C).

Temperature

In Rockaway, the average high-temperature in December decreases, from a chilly 49.3°F (9.6°C) in November, to a cold 40.1°F (4.5°C). In December, the average low-temperature is 28.6°F (-1.9°C).

Humidity

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

Rainfall

In Rockaway, during December, the rain falls for 5.5 days and regularly aggregates up to 0.71" (18mm) of precipitation. Throughout the year, in Rockaway, there are 81.9 rainfall days, and 6.69" (170mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In Rockaway, the average water temperature is 46.8°F (8.2°C).
Note: Swimming in 46.8°F (8.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

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

Sunshine

In Rockaway, the average sunshine is 4.7h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Rockaway?

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

What is the most humid month in Rockaway?

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

What is the average humidity in December in Rockaway?

The average relative humidity in December is 81%.

How many days does it rain in December in Rockaway?

In Rockaway, New Jersey, in December, it is raining for 5.5 days, with typically 0.71" (18mm) of accumulated precipitation.

How many days does it snow in December in Rockaway?

In Rockaway, during December, snow falls for 2.5 days and regularly aggregates up to 0.47" (12mm) of snow.

How cold is the water in December in Rockaway?

In Rockaway, New Jersey, in December, the average water temperature is 46.8°F (8.2°C). Swimming in 46.8°F (8.2°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Rockaway?

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

What is the average length of the day in December in Rockaway?

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

How long on average sun shines in December in Rockaway?

The average sunshine in December in Rockaway is 4.7h.

What are the months with the lowest UV index in Rockaway?

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

What is the UV index reading in December in Rockaway?

In Rockaway, New Jersey, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.
Average temperature in December - Rockaway, NJ
  • Average high temperature in December: 4.5°C

The warmest month (with the highest average high temperature) is July (28.3°C).
The month with the lowest average high temperature is January (1.3°C).

  • Average low temperature in December: -1.9°C

The month with the highest average low temperature is July (17.8°C).
The coldest month (with the lowest average low temperature) is January (-6.2°C).

Average pressure in December - Rockaway, NJ
  • Average pressure in December: 1018.6mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in December - Rockaway, NJ
  • Average wind speed in December: 11.9km/h

The windiest month (with the highest average wind speed) is March (13.2km/h).
The calmest month (with the lowest average wind speed) is August (8.2km/h).

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%).

Average rainfall in December - Rockaway, NJ
  • Average rainfall in December: 18mm

The wettest month (with the highest rainfall) is July (20mm).
The driest month (with the least rainfall) is September (4mm).

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).

Average snowfall in December - Rockaway, NJ
  • Average snowfall in December: 12mm

The month with the highest snowfall is March (20mm).
Months with the least snowfall are June, July, August and September (0mm).

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).

Average sea temperature in December - Rockaway, NJ
  • Average sea temperature in December: 8.2°C

The best month for swimming (with the highest average sea temperature) is August (23.5°C).
The coldest month (with the lowest average sea temperature) is February (4°C).

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).

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).

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).

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).

Average visibility in December - Rockaway, NJ
  • Average visibility in December: 9km

Months with the highest visibility are January, March, April, November and December (9km).
Months with the lowest visibility are February, May, June, July, August, September and October (8km).