December weather forecast
Bethlehem, NH

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Weather in December

December, the first month of the winter in Bethlehem, is still a freezing cold month, with an average temperature fluctuating between 18.1°F (-7.7°C) and 28.2°F (-2.1°C).

Temperature

As November transitions into December, Bethlehem sees a drop in the average high-temperature, transitioning from a cold 39.4°F (4.1°C) to a subzero cold 28.2°F (-2.1°C). During the month of December, the temperature in Bethlehem generally drops to a low average of 18.1°F (-7.7°C).

Humidity

In December, the average relative humidity in Bethlehem is 86%.

Rainfall

In Bethlehem, New Hampshire, during December, the rain falls for 10.6 days and regularly aggregates up to 2.48" (63mm) of precipitation. In Bethlehem, during the entire year, the rain falls for 164.3 days and collects up to 29.45" (748mm) of precipitation.

Snowfall

Months with snowfall in Bethlehem are January through May, October through December. In Bethlehem, in December, snow falls for 19 days, with typically accumulated 8.23" (209mm) of snow. In Bethlehem, during the entire year, snow falls for 99.6 days and aggregates up to 57.68" (1465mm) of snow.

Daylight

December has the shortest days of the year, with an average of 8h and 54min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:09 pm. On the last day of December, in Bethlehem, sunrise is at 7:22 am and sunset at 4:17 pm EST.

Sunshine

In December, the average sunshine is 3.4h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 1 during December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
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Frequently asked questions

How cold is it in Bethlehem in December?

In December, the average high-temperature and low-temperature are 28.2°F (-2.1°C) and 18.1°F (-7.7°C) respectively.

What is the average humidity in December in Bethlehem?

In Bethlehem, the average relative humidity in December is 86%.

How much does it rain in Bethlehem in December?

In Bethlehem, in December, it is raining for 10.6 days, with typically 2.48" (63mm) of accumulated precipitation.

How much does it snow in Bethlehem in December?

In Bethlehem, New Hampshire, in December, during 19 snowfall days, 8.23" (209mm) of snow is typically accumulated.

What is the month with the shortest days in Bethlehem?

With an average of 8h and 54min of daylight, December has the shortest days of the year in Bethlehem, New Hampshire.

How many hours of daylight does Bethlehem have in December?

In Bethlehem, New Hampshire, the average day length in December is 8h and 55min.

When are sunrise and sunset in December in Bethlehem?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:09 pm. On the last day of the month, in Bethlehem, sunrise is at 7:22 am and sunset at 4:17 pm EST.

How many hours of sunshine does Bethlehem have in December?

In December, the average sunshine duration in Bethlehem, New Hampshire, is 3.4h.

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

The months with the lowest UV index in Bethlehem are January, February and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Bethlehem?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat 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
Bethlehem, NH

Average temperature in December - Bethlehem, NH
  • Average high temperature in December: 28.2°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (22.5°F).

  • Average low temperature in December: 18.1°F

The month with the highest average low temperature is July (54.1°F).
The coldest month (with the lowest average low temperature) is January (9.3°F).

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Average pressure in December
Bethlehem, NH

Average pressure in December - Bethlehem, NH
  • Average pressure in December: 30.04"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Bethlehem, NH

Average wind speed in December - Bethlehem, NH
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in December
Bethlehem, NH

Average humidity in December - Bethlehem, NH
  • Average humidity in December: 86%

The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (76%).

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Average rainfall in December
Bethlehem, NH

Average rainfall in December - Bethlehem, NH
  • Average rainfall in December: 2.48"

The wettest month (with the highest rainfall) is October (2.91").
The driest month (with the least rainfall) is September (2.09").

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Average rainfall days in December
Bethlehem, NH

Average rainfall days in December - Bethlehem, NH
  • Average rainfall days in December: 10.6 days

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (6.7 days).

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Average snowfall in December
Bethlehem, NH

Average snowfall in December - Bethlehem, NH
  • Average snowfall in December: 8.23"

The month with the highest snowfall is February (13.58").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Bethlehem, NH

Average snowfall days in December - Bethlehem, NH
  • Average snowfall days in December: 19 days

The month with the highest number of snowfall days is January (21.1 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
Bethlehem, NH

Average daylight in December / Average sunshine in December - Bethlehem, NH
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 3h and 2min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 3h and 0min).

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Average sunshine days in December
Bethlehem, NH

Average sunshine days in December - Bethlehem, NH
  • Average sunshine days in December: 8.7 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is February (5.9 days).

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Average UV index in December
Bethlehem, NH

Average UV index in December - Bethlehem, NH
  • Average UV index in December: 1

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February and December (UV index 1).

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Average cloud cover in December
Bethlehem, NH

Average cloud cover in December - Bethlehem, NH
  • Average cloud cover in December: 67

The month with the most cloud cover is February (Cloud cover 71).
The months with the least cloud cover are July and August (Cloud cover 39).

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Average visibility in December
Bethlehem, NH

Average visibility in December - Bethlehem, NH
  • Average visibility in December: 4mi

The months with the highest visibility are April, May, June, July, August, October and November (5mi).
The months with the lowest visibility are January, February, March, September and December (4mi).

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Bethlehem, New Hampshire, USA

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