December weather forecast
Ortley Terrace, NJ

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Weather in December

December, the first month of the winter in Ortley Terrace, is still a chilly month, with an average temperature varying between 37.8°F (3.2°C) and 45.1°F (7.3°C).

Temperature

The arrival of December suggests a slight decrease in the average high-temperature, moving from a cool 53.2°F (11.8°C) in November to a chilly 45.1°F (7.3°C). Ortley Terrace registers an average low-temperature of 37.8°F (3.2°C) throughout December, a modest decrease from its daytime highs.

Humidity

In December, the average relative humidity is 76%.

Rainfall

The month with the most rainfall is December, when the rain falls for 11.8 days and typically aggregates up to 3.7" (94mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Ortley Terrace, in December, during 1.9 snowfall days, 1.1" (28mm) of snow is typically accumulated. Throughout the year, there are 13.1 snowfall days, and 4.65" (118mm) of snow is accumulated.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:59 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:41 pm EST.

Sunshine

In December, the average sunshine in Ortley Terrace is 5.1h.

UV index

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: A typical high UV index of 2 in December suggests the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. The solar radiation around mid-day is intense; avoid the Sun and stay safe. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.

Frequently asked questions

What is the temperature in December?

The high-temperature, in December, in Ortley Terrace, is 45.1°F (7.3°C), while the low-temperature averages to 37.8°F (3.2°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

What is the wettest month?

December is the month with the most rainfall. Rain falls for 11.8 days and accumulates 3.7" (94mm) of precipitation.

How many days does it rain in December?

In Ortley Terrace, during December, the rain falls for 11.8 days and regularly aggregates up to 3.7" (94mm) of precipitation.

How much does it snow in December?

In Ortley Terrace, during December, snow falls for 1.9 days and regularly aggregates up to 1.1" (28mm) of snow.

What is the month with the shortest days in Ortley Terrace?

With an average of 9h and 24min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In December, the average day length is 9h and 23min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:59 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:41 pm EST.

How long on average sun shines in December?

In Ortley Terrace, the average sunshine duration in December is 5.1h.

What are the months with the lowest UV index?

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

How high is the UV index in December in Ortley Terrace?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's 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
Ortley Terrace, NJ

Average temperature in December - Ortley Terrace, NJ
  • Average high temperature in December: 45.1°F

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (39°F).

  • Average low temperature in December: 37.8°F

The month with the highest average low temperature is August (71.6°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).

Average pressure in December
Ortley Terrace, NJ

Average pressure in December - Ortley Terrace, 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
Ortley Terrace, NJ

Average wind speed in December - Ortley Terrace, NJ
  • Average wind speed in December: 12.9mph

The windiest month (with the highest average wind speed) is January (13.5mph).
The calmest month (with the lowest average wind speed) is July (8.8mph).

Average humidity in December
Ortley Terrace, NJ

Average humidity in December - Ortley Terrace, NJ
  • Average humidity in December: 76%

The months with the highest relative humidity are May and June (81%).
The months with the lowest relative humidity are January and November (74%).

Average rainfall in December
Ortley Terrace, NJ

Average rainfall in December - Ortley Terrace, NJ
  • Average rainfall in December: 3.7"

The wettest month (with the highest rainfall) is December (3.7").
The driest month (with the least rainfall) is January (2.01").

Average rainfall days in December
Ortley Terrace, NJ

Average rainfall days in December - Ortley Terrace, NJ
  • Average rainfall days in December: 11.8 days

The month with the highest number of rainy days is July (16.3 days).
The month with the least rainy days is January (9 days).

Average snowfall in December
Ortley Terrace, NJ

Average snowfall in December - Ortley Terrace, NJ
  • Average snowfall in December: 1.1"

The month with the highest snowfall is January (1.34").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Ortley Terrace, NJ

Average snowfall days in December - Ortley Terrace, NJ
  • Average snowfall days in December: 1.9 days

The month with the highest number of snowfall days is January (4.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Ortley Terrace, NJ

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

The month with the longest days is June (Average daylight: 15h and 0min).
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 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in December
Ortley Terrace, NJ

Average sunshine days in December - Ortley Terrace, NJ
  • Average sunshine days in December: 15.9 days

The month with the most sunshine days is November (18.2 days).
The month with the least sunshine days is July (13.1 days).

Average UV index in December
Ortley Terrace, NJ

Average UV index in December - Ortley Terrace, NJ
  • Average UV index in December: 2

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

Average cloud cover in December
Ortley Terrace, NJ

Average cloud cover in December - Ortley Terrace, NJ
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 28).

Average visibility in December
Ortley Terrace, NJ

Average visibility in December - Ortley Terrace, 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).

Ortley Terrace, New Jersey, USA

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