December weather forecast
Middlesex, NJ

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Weather in December

December, the first month of the winter in Middlesex, is also an icy month, with an average temperature varying between 41.9°F (5.5°C) and 30.7°F (-0.7°C).

Temperature

In Middlesex, the average high-temperature in December drops from a fresh 50.9°F (10.5°C) in November to an icy 41.9°F (5.5°C). Middlesex registers a consistent average low-temperature of 30.7°F (-0.7°C) during December.

Humidity

In Middlesex, New Jersey, the average relative humidity in December is 78%.

Rainfall

The month with the most rainfall in Middlesex, New Jersey, is December, when the rain falls for 10.5 days and typically aggregates up to 3.31" (84mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Middlesex, in December, snow falls for 4.3 days, with typically accumulated 2.13" (54mm) of snow. In Middlesex, New Jersey, during the entire year, snow falls for 26.7 days and aggregates up to 12.68" (322mm) of snow.

Daylight

December has the shortest days of the year in Middlesex, with an average of 9h and 18min of daylight.
On the first day of December in Middlesex, sunrise is at 7:02 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:41 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index in Middlesex are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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Frequently asked questions

Is December cold in Middlesex?

During December, Middlesex experiences an average high-temperature of 41.9°F (5.5°C) and a low-temperature of 30.7°F (-0.7°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in August is evaluated at 87.8°F (31°C).

What is the average humidity in December in Middlesex?

In Middlesex, the average relative humidity in December is 78%.

What is the wettest month in Middlesex?

December is the month with the most rainfall in Middlesex. Rain falls for 10.5 days and accumulates 3.31" (84mm) of precipitation.

How much does it rain in Middlesex in December?

In Middlesex, New Jersey, in December, during 10.5 rainfall days, 3.31" (84mm) of precipitation is typically accumulated.

How many days does it snow in December in Middlesex?

In Middlesex, during December, snow falls for 4.3 days and regularly aggregates up to 2.13" (54mm) of snow.

What is the month with the shortest days in Middlesex?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Middlesex, New Jersey.

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

The average day length in December in Middlesex is 9h and 20min.

What time are sunrise and sunset in December in Middlesex?

On the first day of December in Middlesex, New Jersey, sunrise is at 7:02 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:41 pm EST.

How long on average sun shines in December in Middlesex?

In December, the average sunshine duration in Middlesex, New Jersey, is 4.8h.

What is the month with the lowest UV index in Middlesex?

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

How high is the UV index in December in Middlesex?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk 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
Middlesex, NJ

Average temperature in December - Middlesex, NJ
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

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Average pressure in December
Middlesex, NJ

Average pressure in December - Middlesex, 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).

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Average wind speed in December
Middlesex, NJ

Average wind speed in December - Middlesex, NJ
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in December
Middlesex, NJ

Average humidity in December - Middlesex, NJ
  • Average humidity in December: 78%

The month with the highest relative humidity is February (79%).
The months with the lowest relative humidity are April and August (73%).

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Average rainfall in December
Middlesex, NJ

Average rainfall in December - Middlesex, NJ
  • Average rainfall in December: 3.31"

The wettest month (with the highest rainfall) is December (3.31").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in December
Middlesex, NJ

Average rainfall days in December - Middlesex, NJ
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (8.4 days).

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Average snowfall in December
Middlesex, NJ

Average snowfall in December - Middlesex, NJ
  • Average snowfall in December: 2.13"

The month with the highest snowfall is March (4.06").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Middlesex, NJ

Average snowfall days in December - Middlesex, NJ
  • Average snowfall days in December: 4.3 days

The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Middlesex, 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 18min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in December
Middlesex, NJ

Average sunshine days in December - Middlesex, NJ
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is May (11.6 days).

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Average UV index in December
Middlesex, NJ

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

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Average cloud cover in December
Middlesex, NJ

Average cloud cover in December - Middlesex, NJ
  • Average cloud cover in December: 49

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 34).

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Average visibility in December
Middlesex, NJ

Average visibility in December - Middlesex, NJ
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).

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Middlesex, New Jersey, USA

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