December weather forecast and climate
Wyckoff, NJ

December, the first month of the winter, in Wyckoff, is also a wintry month, with average temperature ranging between max 40.1°F (4.5°C) and min 28.9°F (-1.7°C).

Temperature

In December, the average high-temperature drops, from a chilly 49.8°F (9.9°C) in November, to a wintry 40.1°F (4.5°C). In December, in Wyckoff, New Jersey, the average low-temperature is 28.9°F (-1.7°C).

Humidity

Months with the highest humidity in Wyckoff, New Jersey, are February and December, with an average relative humidity of 80%.

Rainfall

In Wyckoff, it is raining for 9.1 days, with typically 2.48" (63mm) of accumulated precipitation. In Wyckoff, during the entire year, the rain falls for 148.6 days and collects up to 26.18" (665mm) of precipitation.

Snowfall

Months with snowfall in Wyckoff, New Jersey, are January through May, October through December. In Wyckoff, in December, snow falls for 4.1 days, with typically accumulated 2.6" (66mm) of snow. In Wyckoff, during the entire year, snow falls for 25.5 days, and aggregates up to 15.83" (402mm) of snow.

Daylight

With an average of 9.3h of daylight, December has the shortest days of the year.

Sunshine

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 Wyckoff. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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. 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 Wyckoff?

In Wyckoff, in December, the average high-temperature is 40.1°F (4.5°C), and the average low-temperature is 28.9°F (-1.7°C).

What are the most humid months in Wyckoff?

Months with the highest humidity are February and December, with an average relative humidity of 80%.

What is the average humidity in December in Wyckoff?

The average relative humidity in December in Wyckoff is 80%.

How much does it rain in Wyckoff in December?

In Wyckoff, New Jersey, in December, during 9.1 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

How much does it snow in Wyckoff in December?

In December, in Wyckoff, it is snowing for 4.1 days. Throughout December, 2.6" (66mm) of snow is accumulated.

What is the month with the shortest days in Wyckoff?

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

How many hours of daylight does Wyckoff have in December?

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

How long on average sun shines in December in Wyckoff?

In Wyckoff, New Jersey, the average sunshine in December is 4.7h.

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

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

How high is the UV index in December in Wyckoff?

In Wyckoff, New Jersey, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to the UV radiation.
Average temperature in December - Wyckoff, NJ
  • Average high temperature in December: 4.5°C

The warmest month (with the highest average high temperature) is July (28.8°C).
The month with the lowest average high temperature is January (1.4°C).

  • Average low temperature in December: -1.7°C

The month with the highest average low temperature is July (18.1°C).
The coldest month (with the lowest average low temperature) is January (-5.8°C).

Average pressure in December - Wyckoff, NJ
  • Average pressure in December: 1018.4mbar

The month with the highest atmospheric pressure is November (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.6mbar).

Average wind speed in December - Wyckoff, NJ
  • Average wind speed in December: 11.6km/h

The windiest month (with the highest average wind speed) is March (12.9km/h).
The calmest month (with the lowest average wind speed) is August (8.2km/h).

Average humidity in December - Wyckoff, NJ
  • Average humidity in December: 80%

Months with the highest relative humidity are February and December (80%).
Months with the lowest relative humidity are April, July and August (74%).

Average rainfall in December - Wyckoff, NJ
  • Average rainfall in December: 63mm

The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is September (38mm).

Average rainfall days in December - Wyckoff, NJ
  • Average rainfall days in December: 9.1 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (6.6 days).

Average snowfall in December - Wyckoff, NJ
  • Average snowfall in December: 66mm

The month with the highest snowfall is March (108mm).
Months with the least snowfall are June, July, August and September (0mm).

Average snowfall days in December - Wyckoff, NJ
  • Average snowfall days in December: 4.1 days

The month with the highest number of snowfall days is February (7.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Wyckoff, 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 - Wyckoff, NJ
  • Average sunshine days in December: 17.7 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (11.9 days).

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

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

Average cloud cover in December - Wyckoff, NJ
  • Average cloud cover in December: 50

The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

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

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