December weather forecast
Grenloch, NJ

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Weather in December

December, the first month of the winter in Grenloch, is also a frosty month, with temperature in the range of an average low of 33.1°F (0.6°C) and an average high of 44.2°F (6.8°C).

Temperature

December's onset brings a slight change in high-temperatures, falling from a cool 53.6°F (12°C) in November to a chilly 44.2°F (6.8°C). Throughout December, the average low-temperature dips to an icy 33.1°F (0.6°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 7.3 days. Throughout December, 1.26" (32mm) of precipitation is accumulated. Throughout the year, there are 117 rainfall days, and 12.13" (308mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, May, November and December. In Grenloch, during December, snow falls for 2 days and regularly aggregates up to 0.24" (6mm) of snow. In Grenloch, during the entire year, snow falls for 11.4 days and aggregates up to 3.11" (79mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:45 pm EST.

Sunshine

In December, the average sunshine is 5.1h.

UV index

January, February, 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 unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Updated: Jul 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

An average high-temperature, in December, in Grenloch, is 44.2°F (6.8°C) and the average low-temperature is 33.1°F (0.6°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines relative humidity and air temperature, is estimated at 89.6°F (32°C).

What is the average humidity in December?

The average relative humidity in December is 76%.

How much does it rain in December?

In Grenloch, New Jersey, in December, it is raining for 7.3 days, with typically 1.26" (32mm) of accumulated precipitation.

How many days does it snow in December?

In Grenloch, in December, snow falls for 2 days, with typically accumulated 0.24" (6mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Grenloch, the average day length in December is 9h and 25min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:02 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:45 pm EST.

How many hours of sunshine does Grenloch have in December?

In December, the average sunshine duration is 5.1h.

What are the months with the lowest UV index?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December?

In Grenloch, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Grenloch, NJ

Average temperature in December - Grenloch, NJ
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in December: 33.1°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in December
Grenloch, NJ

Average pressure in December - Grenloch, NJ
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Grenloch, NJ

Average wind speed in December - Grenloch, NJ
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.7mph).

Average humidity in December
Grenloch, NJ

Average humidity in December - Grenloch, NJ
  • Average humidity in December: 76%

The month with the highest relative humidity is October (77%).
The month with the lowest relative humidity is April (71%).

Average rainfall in December
Grenloch, NJ

Average rainfall in December - Grenloch, NJ
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is August (1.38").
The driest months (with the least rainfall) are January and September (0.67").

Average rainfall days in December
Grenloch, NJ

Average rainfall days in December - Grenloch, NJ
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (13.7 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in December
Grenloch, NJ

Average snowfall in December - Grenloch, NJ
  • Average snowfall in December: 0.24"

The month with the highest snowfall is February (1.1").
The months with the least snowfall are April, June, July, August, September and October (0").

Average snowfall days in December
Grenloch, NJ

Average snowfall days in December - Grenloch, NJ
  • Average snowfall days in December: 2 days

The month with the highest number of snowfall days is January (3.5 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Grenloch, NJ
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 5h and 1min

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 54min).

Average sunshine days in December
Grenloch, NJ

Average sunshine days in December - Grenloch, NJ
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is November (21.7 days).
The month with the least sunshine days is July (14.3 days).

Average UV index in December
Grenloch, NJ

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

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Grenloch, NJ

Average cloud cover in December - Grenloch, NJ
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 31).

Average visibility in December
Grenloch, NJ

Average visibility in December - Grenloch, 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).

Grenloch, New Jersey, USA

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