December weather forecast and climate
Bethlehem, NH

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

Temperature

In December, the average high-temperature drops, from a cold 39.4°F (4.1°C) in November, to a freezing cold 28.2°F (-2.1°C). In December, the average low-temperature is 18.1°F (-7.7°C).

Humidity

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

Rainfall

In December, the rain falls for 10.6 days. Throughout December, 2.48" (63mm) of precipitation is accumulated. Throughout the year, in Bethlehem, there are 164.3 rainfall days, and 29.45" (748mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Bethlehem, New Hampshire, 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 8.9h of daylight.

Sunshine

The average sunshine in December is 3.4h.

UV index

Months with the lowest UV index in Bethlehem 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 the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 1 transform into the following instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Bethlehem?

The average high-temperature, in December, in Bethlehem, New Hampshire, is 28.2°F (-2.1°C), while the average low-temperature is 18.1°F (-7.7°C).

What is the average humidity in December in Bethlehem?

The average relative humidity in December in Bethlehem is 86%.

How much does it rain in Bethlehem in December?

In Bethlehem, New Hampshire, in December, during 10.6 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

How many days does it snow in December in Bethlehem?

In December, in Bethlehem, it is snowing for 19 days. Throughout December, 8.23" (209mm) of snow is accumulated.

What is the month with the shortest days in Bethlehem?

With an average of 8.9h of daylight, December has the shortest days of the year in Bethlehem.

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

The average length of the day in December in Bethlehem, New Hampshire, is 8.9h.

How long on average sun shines in December in Bethlehem?

The average sunshine in December is 3.4h.

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

Months with the lowest UV index in Bethlehem, New Hampshire, are January, February and December, with an average maximum UV index of 1.

What is the UV index intensity in December in Bethlehem?

In December, the average daily maximum UV index in Bethlehem, New Hampshire, is 1. A UV Index of 2, and less, symbolizes a minimal hazard to health from the exposure to the Sun's UV rays.
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).

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

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

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).

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

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

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").

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).

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

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

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).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Bethlehem, NH
  • Average daylight in December: 8.9h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in December: 3.4h

The month with the most sunshine is August (Average sunshine: 9.9h).
The month with the least sunshine is February (Average sunshine: 3h).

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).

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

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

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).
Months with the least cloud cover are July and August (Cloud cover 39).

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

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