January weather forecast and climate
Rockaway, NJ

January, like December, in Rockaway, New Jersey, is another cold winter month, with average temperature varying between 34.3°F (1.3°C) and 20.8°F (-6.2°C).

Temperature

With an average high-temperature of 34.3°F (1.3°C) and an average low-temperature of 20.8°F (-6.2°C), January is the coldest month.

Humidity

The average relative humidity in Rockaway is 78%.

Rainfall

In Rockaway, it is raining for 4.2 days, with typically 0.43" (11mm) of accumulated precipitation. Throughout the year, 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 January, it is snowing for 4.5 days. Throughout January, 0.51" (13mm) 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, in January, the average water temperature is 41.4°F (5.2°C).
Note: Swimming in 41.4°F (5.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

The average length of the day in January is 9.6h.

Sunshine

In January, the average sunshine is 4.8h.

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 reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays for the average person.
Note: In January, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Rockaway?

January is the coldest month, with an average high-temperature of 34.3°F (1.3°C) and an average low-temperature of 20.8°F (-6.2°C).

What is the temperature in January in Rockaway?

The average high-temperature, in January, in Rockaway, is 34.3°F (1.3°C), while the average low-temperature is 20.8°F (-6.2°C).

What is the average humidity in January in Rockaway?

In January, the average relative humidity in Rockaway, New Jersey, is 78%.

How many days does it rain in January in Rockaway?

In January, the rain falls for 4.2 days. Throughout January, 0.43" (11mm) of precipitation is accumulated.

How much does it snow in Rockaway in January?

In Rockaway, New Jersey, in January, snow falls for 4.5 days, with typically accumulated 0.51" (13mm) of snow.

What is the ocean temperature in January in Rockaway?

In Rockaway, New Jersey, in January, the average water temperature is 41.4°F (5.2°C). Swimming in 41.4°F (5.2°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

How many hours of daylight does Rockaway have in January?

The average length of the day in January in Rockaway, New Jersey, is 9.6h.

How long on average sun shines in January in Rockaway?

The average sunshine in January in Rockaway, New Jersey, is 4.8h.

What is the month 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.

How high is the UV index in January in Rockaway?

The average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a low health threat from the exposure to the Sun's UV radiation.
Average temperature in January - Rockaway, NJ
  • Average high temperature in January: 1.3°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 January: -6.2°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 January - Rockaway, NJ
  • Average pressure in January: 1018.3mbar

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 January - Rockaway, NJ
  • Average wind speed in January: 13km/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 January - Rockaway, NJ
  • Average humidity in January: 78%

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 January - Rockaway, NJ
  • Average rainfall in January: 11mm

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

Average rainfall days in January - Rockaway, NJ
  • Average rainfall days in January: 4.2 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 January - Rockaway, NJ
  • Average snowfall in January: 13mm

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 January - Rockaway, NJ
  • Average snowfall days in January: 4.5 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 January - Rockaway, NJ
  • Average sea temperature in January: 5.2°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 January / Average sunshine in January - Rockaway, NJ
  • Average daylight in January: 9.6h

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 January: 4.8h

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 January - Rockaway, NJ
  • Average sunshine days in January: 24.3 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 January - Rockaway, NJ
  • Average UV index in January: 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 January - Rockaway, NJ
  • Average cloud cover in January: 48

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 January - Rockaway, NJ
  • Average visibility in January: 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).