December weather forecast
Delmont, NJ

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Weather in December

December, the first month of the winter in Delmont, is also a frosty month, with temperature in the range of an average low of 37.9°F (3.3°C) and an average high of 46°F (7.8°C).

Temperature

With the commencement of December, Delmont records a moderate temperature decline, with the average high easing from November's fresh 54.1°F (12.3°C) to a frosty 46°F (7.8°C). Delmont reports an average low-temperature of 37.9°F (3.3°C) during the subtly cooler December nights.

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, in Delmont, the rain falls for 9.8 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. Throughout the year, in Delmont, there are 130.8 rainfall days, and 13.23" (336mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Delmont, in December, during 2.5 snowfall days, 0.47" (12mm) of snow is typically accumulated. In Delmont, New Jersey, during the entire year, snow falls for 13.2 days and aggregates up to 1.85" (47mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:37 pm. On the last day of December, in Delmont, sunrise is at 7:19 am and sunset at 4:47 pm EST.

Sunshine

In December, the average sunshine in Delmont is 5.2h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Delmont. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Employ a wide-brim hat for potent defense against up to 50% of UV rays. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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Frequently asked questions

What are December temperatures in Delmont?

In December, in Delmont, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 37.9°F (3.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines air temperature and relative humidity, in July is appraised at 86°F (30°C).

What is the average humidity in December in Delmont?

In December, the average relative humidity is 76%.

How much does it rain in Delmont in December?

In December, the rain falls for 9.8 days. Throughout December, 1.06" (27mm) of precipitation is accumulated.

How many days does it snow in December in Delmont?

In Delmont, New Jersey, in December, during 2.5 snowfall days, 0.47" (12mm) of snow is typically accumulated.

What is the month with the shortest days in Delmont?

December has the shortest days of the year in Delmont, with an average of 9h and 30min of daylight.

How many hours of daylight does Delmont have in December?

In Delmont, the average day length in December is 9h and 28min.

When are sunrise and sunset in December in Delmont?

In December, on the first day of the month, sunrise is at 7:00 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:47 pm EST.

How many hours of sunshine does Delmont have in December?

The average sunshine duration in December in Delmont is 5.2h.

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

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Delmont, New Jersey.

How high is the UV index in December in Delmont?

In December, the average daily maximum UV index in Delmont is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
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
Delmont, NJ

Average temperature in December - Delmont, NJ
  • Average high temperature in December: 46°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 37.9°F

The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).

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Average pressure in December
Delmont, NJ

Average pressure in December - Delmont, NJ
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in December
Delmont, NJ

Average wind speed in December - Delmont, NJ
  • Average wind speed in December: 11.4mph

The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).

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Average humidity in December
Delmont, NJ

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

The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).

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Average rainfall in December
Delmont, NJ

Average rainfall in December - Delmont, NJ
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in December
Delmont, NJ

Average rainfall days in December - Delmont, NJ
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (7 days).

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Average snowfall in December
Delmont, NJ

Average snowfall in December - Delmont, NJ
  • Average snowfall in December: 0.47"

The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Delmont, NJ

Average snowfall days in December - Delmont, NJ
  • Average snowfall days in December: 2.5 days

The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Delmont, NJ
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in December
Delmont, NJ

Average sunshine days in December - Delmont, NJ
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (13.4 days).

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Average UV index in December
Delmont, NJ

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

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Average cloud cover in December
Delmont, NJ

Average cloud cover in December - Delmont, NJ
  • Average cloud cover in December: 44

The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 25).

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Average visibility in December
Delmont, NJ

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

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

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Delmont, New Jersey, USA

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