December weather forecastRockaway, NJ
December
Weather in December
The first month of the winter, December, is also a wintry month in Rockaway, New Jersey, with an average temperature ranging between max 40.1°F (4.5°C) and min 28.6°F (-1.9°C).Temperature
In Rockaway, the average high-temperature in December drops from a frosty 49.3°F (9.6°C) in November to a cold 40.1°F (4.5°C). December nights in Rockaway are marked by an average temperature drop to a subzero cold 28.6°F (-1.9°C).Humidity
The months with the highest humidity in Rockaway are February, October and December, with an average relative humidity of 81%.Rainfall
In December, in Rockaway, the rain falls for 5.5 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In Rockaway, during the entire year, the rain falls for 81.9 days and collects up to 6.69" (170mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Rockaway, in December, during 2.5 snowfall days, 0.47" (12mm) of snow is typically accumulated. Throughout the year, in Rockaway, 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: Diving into 46.8°F (8.2°C) is practical below 50°F (10°C), given you're wearing protective swim gear; without it, expect a quick onset of cold shock and a struggle to breathe. Merely touching waters at 55.4°F (13°C) feels ice-cold.
Daylight
The month with the shortest days is December, with an average of 9h and 18min of daylight.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, in Rockaway, sunrise is at 7:22 am and sunset at 4:40 pm EST.
Sunshine
In Rockaway, the average sunshine in December 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 in Rockaway. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 2 in December interprets into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in December
Rockaway, 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
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).
Average humidity in December
Rockaway, NJ
- Average humidity in December: 81%
The 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: 0.71"
The wettest month (with the highest rainfall) is July (0.79").
The driest month (with the least rainfall) is September (0.16").
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: 0.47"
The month with the highest snowfall is March (0.79").
The months with the least snowfall are June, July, August and September (0").
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).
The 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: 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).
Average daylight in December /
Average sunshine in December
Rockaway, NJ
- Average daylight in December: 9h and 18min
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 42min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
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
The months with the highest UV index are June and July (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
Rockaway, NJ
- Average cloud cover in December: 50
The months with the most cloud cover are February and March (Cloud cover 51).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in December
Rockaway, NJ
- Average visibility in December: 6mi
The months with the highest visibility are January, March, April, November and December (6mi).
The months with the lowest visibility are February, May, June, July, August, September and October (5mi).
