December weather forecast and climate
Holmdel, NJ

December, the first month of the winter, in Holmdel, is still a chilly month, with average temperature ranging between min 34.5°F (1.4°C) and max 43.9°F (6.6°C).

Temperature

In December, the average high-temperature marginally drops, from a fresh 52.2°F (11.2°C) in November, to a frosty 43.9°F (6.6°C). The average low-temperature, in December, is 34.5°F (1.4°C).

Humidity

In Holmdel, New Jersey, the average relative humidity in December is 76%.

Rainfall

In Holmdel, during 4.9 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In Holmdel, during the entire year, the rain falls for 68.3 days and collects up to 5.75" (146mm) of precipitation.

Snowfall

January through March and December are months with snowfall in Holmdel. December is the first month it typically snows in Holmdel. Throughout December, in the average 1.1 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, there are 8.7 snowfall days, and 0.43" (11mm) of snow is accumulated.

Daylight

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

Sunshine

In Holmdel, the average sunshine is 5.1h.

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Holmdel?

The average high-temperature, in December, in Holmdel, New Jersey, is 43.9°F (6.6°C), while the average low-temperature is 34.5°F (1.4°C).

What is the average humidity in December in Holmdel?

In Holmdel, New Jersey, the average relative humidity in December is 76%.

How many days does it rain in December in Holmdel?

In Holmdel, in December, it is raining for 4.9 days, with typically 0.67" (17mm) of accumulated precipitation.

When does it start snowing in Holmdel?

December is the first month it typically snows. Throughout December, in the average 1.1 snowfall days, it receives 0.08" (2mm) of snow.

What is the month with the shortest days in Holmdel?

December has the shortest days of the year in Holmdel, New Jersey, with an average of 9.3h of daylight.

What is the average length of the day in December in Holmdel?

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

How many hours of sunshine does Holmdel have in December?

In Holmdel, the average sunshine in December is 5.1h.

When is the lowest UV index in Holmdel?

Months with the lowest UV index in Holmdel are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Holmdel?

In Holmdel, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV radiation.
Average temperature in December - Holmdel, NJ
  • Average high temperature in December: 6.6°C

The warmest month (with the highest average high temperature) is July (27.6°C).
The month with the lowest average high temperature is January (3.2°C).

  • Average low temperature in December: 1.4°C

The month with the highest average low temperature is July (21°C).
The coldest month (with the lowest average low temperature) is January (-2.6°C).

Average pressure in December - Holmdel, NJ
  • Average pressure in December: 1018.5mbar

The month with the highest atmospheric pressure is November (1019.5mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in December - Holmdel, NJ
  • Average wind speed in December: 16.8km/h

The windiest month (with the highest average wind speed) is January (17.9km/h).
The calmest month (with the lowest average wind speed) is July (11.5km/h).

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

Months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (73%).

Average rainfall in December - Holmdel, NJ
  • Average rainfall in December: 17mm

The wettest month (with the highest rainfall) is July (18mm).
The driest month (with the least rainfall) is September (3mm).

Average rainfall days in December - Holmdel, NJ
  • Average rainfall days in December: 4.9 days

The month with the highest number of rainy days is July (8 days).
The month with the least rainy days is January (3.4 days).

Average snowfall in December - Holmdel, NJ
  • Average snowfall in December: 2mm

The month with the highest snowfall is January (4mm).
Months with the least snowfall are April, May, June, July, August, September, October and November (0mm).

Average snowfall days in December - Holmdel, NJ
  • Average snowfall days in December: 1.1 days

The month with the highest number of snowfall days is February (2.6 days).
Months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

Average daylight in December / Average sunshine in December - Holmdel, NJ
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 5.1h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.9h).

Average sunshine days in December - Holmdel, NJ
  • Average sunshine days in December: 24.5 days

The month with the most sunshine days is January (25.7 days).
The month with the least sunshine days is July (17.3 days).

Average UV index in December - Holmdel, 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, November and December (UV index 2).

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

Months with the most cloud cover are February, March and December (Cloud cover 46).
Months with the least cloud cover are July and August (Cloud cover 28).

Average visibility in December - Holmdel, NJ
  • Average visibility in December: 10km

Months with the highest visibility are January, February, March, April, July, August, September, October, November and December (10km).
Months with the lowest visibility are May and June (9km).