December weather forecast and climate
Deal Park, NJ

The first month of the winter, December, is still a chilly month in Deal Park, New Jersey, with average temperature fluctuating between 36.3°F (2.4°C) and 44.4°F (6.9°C).

Temperature

In December, the average high-temperature slightly decreases, from a cool 52.3°F (11.3°C) in November, to a chilly 44.4°F (6.9°C). The average low-temperature, in December, is 36.3°F (2.4°C).

Humidity

In December, the average relative humidity is 75%.

Rainfall

In Deal Park, in December, it is raining for 8.8 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 122.1 rainfall days, and 11.14" (283mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Deal Park, New Jersey, are January through March, October and December. The month with the most snowfall in Deal Park is December when snow falls for 3.1 days and typically aggregates up to 0.47" (12mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9.4h of daylight.

Sunshine

The average sunshine in Deal Park, New Jersey, is 5.1h.

UV index

Months with the lowest UV index in Deal Park are January through March, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to the UV radiation for average individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Deal Park?

In Deal Park, in December, the average high-temperature is 44.4°F (6.9°C), and the average low-temperature is 36.3°F (2.4°C).

What is the average humidity in December in Deal Park?

In Deal Park, the average relative humidity in December is 75%.

How many days does it rain in December in Deal Park?

In December, the rain falls for 8.8 days. Throughout December, 1.1" (28mm) of precipitation is accumulated.

When does it start snowing in Deal Park?

December is the first month it typically snows in Deal Park. Throughout December, in the average 3.1 snowfall days, it receives 0.47" (12mm) of snow.

When does it snow the most in Deal Park?

The month with the most snowfall in Deal Park, New Jersey, is December when snow falls for 3.1 days and typically aggregates up to 0.47" (12mm) of snow.

What is the month with the shortest days in Deal Park?

The month with the shortest days is December, with an average of 9.4h of daylight.

What is the average length of the day in December in Deal Park?

In December, the average length of the day in Deal Park is 9.4h.

How long on average sun shines in December in Deal Park?

In Deal Park, the average sunshine in December is 5.1h.

When is the lowest UV index in Deal Park?

Months with the lowest UV index in Deal Park are January through March, November and December, with an average maximum UV index of 2.

How high is the UV index in December in Deal Park?

In Deal Park, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Deal Park, NJ
  • Average high temperature in December: 6.9°C

The warmest month (with the highest average high temperature) is July (26.8°C).
The month with the lowest average high temperature is January (3.5°C).

  • Average low temperature in December: 2.4°C

The month with the highest average low temperature is July (21.8°C).
The coldest month (with the lowest average low temperature) is January (-1.7°C).

Average pressure in December - Deal Park, 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 - Deal Park, NJ
  • Average wind speed in December: 19.1km/h

The windiest month (with the highest average wind speed) is January (20.2km/h).
The calmest month (with the lowest average wind speed) is July (12.9km/h).

Average humidity in December - Deal Park, NJ
  • Average humidity in December: 75%

Months with the highest relative humidity are May and June (79%).
The month with the lowest relative humidity is November (73%).

Average rainfall in December - Deal Park, NJ
  • Average rainfall in December: 28mm

The wettest month (with the highest rainfall) is July (35mm).
The driest month (with the least rainfall) is January (14mm).

Average rainfall days in December - Deal Park, NJ
  • Average rainfall days in December: 8.8 days

The month with the highest number of rainy days is July (14.6 days).
The month with the least rainy days is November (6.8 days).

Average snowfall in December - Deal Park, NJ
  • Average snowfall in December: 12mm

The month with the highest snowfall is December (12mm).
Months with the least snowfall are April, May, June, July, August, September and November (0mm).

Average snowfall days in December - Deal Park, NJ
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is January (4.2 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Deal Park, NJ
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • 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: 4.8h).

Average sunshine days in December - Deal Park, NJ
  • Average sunshine days in December: 19.1 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is July (14.3 days).

Average UV index in December - Deal Park, 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 - Deal Park, NJ
  • Average cloud cover in December: 46

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December - Deal Park, NJ
  • Average visibility in December: 9km

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