December weather forecast
Caldwell, NJ

Weather in December

December, the first month of the winter, in Caldwell, is still a cold month, with temperature in the range of an average high of 40.8°F (4.9°C) and an average low of 30.4°F (-0.9°C).

Temperature

In December, the average high-temperature drops, from a cool 50.5°F (10.3°C) in November, to a cold 40.8°F (4.9°C). In Caldwell, in December, the average low-temperature is 30.4°F (-0.9°C).

Humidity

February and December, with an average relative humidity of 79%, are most humid months in Caldwell.

Rainfall

In Caldwell, New Jersey, during December, the rain falls for 10.1 days and regularly aggregates up to 2.48" (63mm) of precipitation. In Caldwell, during the entire year, the rain falls for 158 days and collects up to 27.4" (696mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Caldwell, during December, snow falls for 4.4 days and regularly aggregates up to 1.18" (30mm) of snow. In Caldwell, during the entire year, snow falls for 24.3 days, and aggregates up to 9.96" (253mm) of snow.

Daylight

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

Sunshine

In Caldwell, the average sunshine is 4.8h.

UV index

Months with the lowest UV index in Caldwell 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 minimal health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 2 interpret into the following advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the most humid months in Caldwell?

Months with the highest humidity in Caldwell, New Jersey, are February and December, with an average relative humidity of 79%.

What is the average humidity in December in Caldwell?

The average relative humidity in December is 79%.

How much does it rain in Caldwell in December?

In December, the rain falls for 10.1 days. Throughout December, 2.48" (63mm) of precipitation is accumulated.

How many days does it snow in December in Caldwell?

In Caldwell, in December, during 4.4 snowfall days, 1.18" (30mm) of snow is typically accumulated.

What is the month with the shortest days in Caldwell?

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

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

The average length of the day in December in Caldwell is 9.3h.

How long on average sun shines in December in Caldwell?

The average sunshine in December is 4.8h.

When is the lowest UV index in Caldwell?

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

How high is the UV index in December in Caldwell?

In December, the average daily maximum UV index in Caldwell is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Caldwell, NJ

Average temperature in December - Caldwell, NJ
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).

  • Average low temperature in December: 30.4°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in December
Caldwell, NJ

Average pressure in December - Caldwell, NJ
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Caldwell, NJ

Average wind speed in December - Caldwell, NJ
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in December
Caldwell, NJ

Average humidity in December - Caldwell, NJ
  • Average humidity in December: 79%

Months with the highest relative humidity are February and December (79%).
Months with the lowest relative humidity are April and August (73%).

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Average rainfall in December
Caldwell, NJ

Average rainfall in December - Caldwell, NJ
  • Average rainfall in December: 2.48"

The wettest month (with the highest rainfall) is July (3.15").
The driest month (with the least rainfall) is January (1.57").

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Average rainfall days in December
Caldwell, NJ

Average rainfall days in December - Caldwell, NJ
  • Average rainfall days in December: 10.1 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in December
Caldwell, NJ

Average snowfall in December - Caldwell, NJ
  • Average snowfall in December: 1.18"

The month with the highest snowfall is March (3.58").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Caldwell, NJ

Average snowfall days in December - Caldwell, NJ
  • Average snowfall days in December: 4.4 days

The month with the highest number of snowfall days is February (7 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Caldwell, 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: 4.8h

The month with the most sunshine is July (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in December
Caldwell, NJ

Average sunshine days in December - Caldwell, NJ
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (10.7 days).

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Average UV index in December
Caldwell, NJ

Average UV index in December - Caldwell, 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).

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Average cloud cover in December
Caldwell, NJ

Average cloud cover in December - Caldwell, NJ
  • Average cloud cover in December: 48

Months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in December
Caldwell, NJ

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

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

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