December weather forecast
New Castle, NH

Weather in December

The first month of the winter, December, is still a cold month in New Castle, New Hampshire, with an average temperature ranging between max 37.6°F (3.1°C) and min 28°F (-2.2°C).

Temperature

In December, the average high-temperature drops from a frosty 47.1°F (8.4°C) in November to a wintry 37.6°F (3.1°C). In December, the average low-temperature is 28°F (-2.2°C).

Humidity

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

Rainfall

In New Castle, New Hampshire, in December, it is raining for 11.5 days, with typically 2.8" (71mm) of accumulated precipitation. Throughout the year, there are 144.2 rainfall days, and 27.48" (698mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 7.5 days. Throughout December, 3.9" (99mm) of snow is accumulated. In New Castle, during the entire year, snow falls for 35.2 days and aggregates up to 16.97" (431mm) of snow.

Ocean temperature

In New Castle, New Hampshire, the average water temperature is 45.9°F (7.7°C).
Note: Swimming in 45.9°F (7.7°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

December has the shortest days of the year, with an average of 9h and 4min of daylight.
On the first day of the month, sunrise is at 6:54 am and sunset at 4:09 pm. On the last day of December, in New Castle, sunrise is at 7:14 am and sunset at 4:17 pm EST.

Sunshine

February and December, with an average of 4.8h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index in New Castle 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 exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in New Castle?

In December, the average relative humidity in New Castle, New Hampshire, is 78%.

How much does it rain in New Castle in December?

In New Castle, in December, it is raining for 11.5 days, with typically 2.8" (71mm) of accumulated precipitation.

How much does it snow in New Castle in December?

In New Castle, New Hampshire, in December, snow falls for 7.5 days, with typically accumulated 3.9" (99mm) of snow.

What is the ocean temperature in December in New Castle?

In December, the average ocean temperature in New Castle, New Hampshire, is 45.9°F (7.7°C). Swimming in 45.9°F (7.7°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in New Castle?

December has the shortest days of the year in New Castle, New Hampshire, with an average of 9h and 4min of daylight.

How many hours of daylight does New Castle have in December?

In December, the average day length is 9h and 4min.

When are sunrise and sunset in December in New Castle?

On the first day of December, sunrise is at 6:54 am and sunset at 4:09 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 4:17 pm EST.

What is the month with the least sunshine in New Castle?

February and December, with an average of 4.8h of sunshine, are months with the least sunshine in New Castle.

How many hours of sunshine does New Castle have in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index in New Castle?

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

How high is the UV index in December in New Castle?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk 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
New Castle, NH

Average temperature in December - New Castle, NH
  • Average high temperature in December: 37.6°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 (31.8°F).

  • Average low temperature in December: 28°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in December
New Castle, NH

Average pressure in December - New Castle, NH
  • Average pressure in December: 30.03"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
New Castle, NH

Average wind speed in December - New Castle, NH
  • Average wind speed in December: 10.8mph

The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in December
New Castle, NH

Average humidity in December - New Castle, NH
  • Average humidity in December: 78%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).

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Average rainfall in December
New Castle, NH

Average rainfall in December - New Castle, NH
  • Average rainfall in December: 2.8"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days in December
New Castle, NH

Average rainfall days in December - New Castle, NH
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (7.5 days).

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Average snowfall in December
New Castle, NH

Average snowfall in December - New Castle, NH
  • Average snowfall in December: 3.9"

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
New Castle, NH

Average snowfall days in December - New Castle, NH
  • Average snowfall days in December: 7.5 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in December
New Castle, NH

Average sea temperature in December - New Castle, NH
  • Average sea temperature in December: 45.8°F

The best month for swimming (with the highest average sea temperature) is August (65.6°F).
The coldest month (with the lowest average sea temperature) is March (38.5°F).

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Average daylight in December /
Average sunshine in December
New Castle, NH

Average daylight in December / Average sunshine in December - New Castle, NH
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 19min).
The month with the shortest days is December (Average daylight: 9h and 4min).

  • Average sunshine in December: 4h and 48min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in December
New Castle, NH

Average sunshine days in December - New Castle, NH
  • Average sunshine days in December: 14.5 days

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index in December
New Castle, NH

Average UV index in December - New Castle, NH
  • Average UV index in December: 2

The months with the highest UV index are 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
New Castle, NH

Average cloud cover in December - New Castle, NH
  • Average cloud cover in December: 47

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in December
New Castle, NH

Average visibility in December - New Castle, NH
  • 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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