December weather forecast
Castalia, NC

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Weather in December

December, the first month of the winter in Castalia, is still a cool month, with an average temperature varying between 52.5°F (11.4°C) and 38.5°F (3.6°C).

Temperature

A modest decline in the average high-temperature is seen during December, decreasing from a moderate 59.4°F (15.2°C) in November to a fresh 52.5°F (11.4°C). During December, Castalia's temperature falls to a steady low-temperature average of 38.5°F (3.6°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Castalia, in December, during 10.5 rainfall days, 2.52" (64mm) of precipitation is typically accumulated. Throughout the year, in Castalia, there are 160.1 rainfall days, and 33.11" (841mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March and December. December is the first month it typically snows. Throughout December, in the average 0.6 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, in Castalia, there are 5 snowfall days, and 3.46" (88mm) of snow is accumulated.

Daylight

With an average of 9h and 48min of daylight, December has the shortest days of the year in Castalia, North Carolina.
On the first day of December, sunrise is at 7:05 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:08 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.4h of sunshine.

UV index

In Castalia, North Carolina, the average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 3 in December translates into the following recommendations:
Ensure safety - Sun damage prevention is strongly urged. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What is the average December temperature in Castalia?

In Castalia, 52.5°F (11.4°C) is the average high-temperature and 38.5°F (3.6°C) is the average low-temperature during December. The average heat index (a.k.a. 'feels like', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 86°F (30°C).

What is the average humidity in December in Castalia?

In Castalia, North Carolina, the average relative humidity in December is 77%.

How much does it rain in Castalia in December?

In Castalia, during December, the rain falls for 10.5 days and regularly aggregates up to 2.52" (64mm) of precipitation.

When does it start to snow in Castalia?

December is the first month it typically snows. Throughout December, in the average 0.6 snowfall days, it receives 0.51" (13mm) of snow.

What is the month with the shortest days in Castalia?

December has the shortest days of the year in Castalia, North Carolina, with an average of 9h and 48min of daylight.

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

The average day length in December in Castalia, North Carolina, is 9h and 46min.

When are sunrise and sunset in December in Castalia?

On the first day of December, sunrise is at 7:05 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:08 pm EST.

What is the month with the least sunshine in Castalia?

The month with the least sunshine is December, with an average of 5.4h of sunshine.

How many hours of sunshine does Castalia have in December?

The average sunshine duration in December in Castalia, North Carolina, is 5.4h.

What is the UV index reading in December in Castalia?

In Castalia, North Carolina, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe 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
Castalia, NC

Average temperature in December - Castalia, NC
  • Average high temperature in December: 52.5°F

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (47.7°F).

  • Average low temperature in December: 38.5°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (32.5°F).

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Average pressure in December
Castalia, NC

Average pressure in December - Castalia, NC
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).

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Average wind speed in December
Castalia, NC

Average wind speed in December - Castalia, NC
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is April (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in December
Castalia, NC

Average humidity in December - Castalia, NC
  • Average humidity in December: 77%

The month with the highest relative humidity is September (78%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in December
Castalia, NC

Average rainfall in December - Castalia, NC
  • Average rainfall in December: 2.52"

The wettest month (with the highest rainfall) is August (3.94").
The driest month (with the least rainfall) is October (2.13").

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Average rainfall days in December
Castalia, NC

Average rainfall days in December - Castalia, NC
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is July (18.7 days).
The month with the least rainy days is November (8.6 days).

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Average snowfall in December
Castalia, NC

Average snowfall in December - Castalia, NC
  • Average snowfall in December: 0.51"

The month with the highest snowfall is January (1.54").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Castalia, NC

Average snowfall days in December - Castalia, NC
  • Average snowfall days in December: 0.6 days

The month with the highest number of snowfall days is February (2 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
Castalia, NC

Average daylight in December / Average sunshine in December - Castalia, NC
  • Average daylight in December: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 48min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in December
Castalia, NC

Average sunshine days in December - Castalia, NC
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is October (20 days).
The month with the least sunshine days is July (9.8 days).

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Average UV index in December
Castalia, NC

Average UV index in December - Castalia, NC
  • Average UV index in December: 3

The months with the highest UV index are May, June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).

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Average cloud cover in December
Castalia, NC

Average cloud cover in December - Castalia, NC
  • Average cloud cover in December: 42

The months with the most cloud cover are February and March (Cloud cover 43).
The month with the least cloud cover is June (Cloud cover 32).

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Average visibility in December
Castalia, NC

Average visibility in December - Castalia, NC
  • 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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Castalia, North Carolina, USA

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