December weather forecast and climate
Charlotte Amalie, VI

The Charlotte Amalie Harbour within the United States Virgin Islands
The Charlotte Amalie Harbour within the United States Virgin Islands

Weather in December

December, the first month of the winter, in Charlotte Amalie, is also a moderately hot month, with average temperature fluctuating between 80.6°F (27°C) and 78.4°F (25.8°C).

Temperature

In Charlotte Amalie, United States Virgin Islands, the average high-temperature in December is essentially the same as in November - a still warm 80.6°F (27°C). The average low-temperature, in December, is 78.4°F (25.8°C).

Heat index

In December, the average heat index is evaluated at 84.7°F (29.3°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'feels like', or 'real feel', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. This effect is individual, with diverse people perceiving weather differently for numerous reasons (differences in body mass, height, and shape, metabolic differences, wind), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

January through March, October through December, with an average relative humidity of 75%, are the least humid months.

Rainfall

In Charlotte Amalie, during 22.6 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Charlotte Amalie, during the entire year, the rain falls for 253.1 days and collects up to 33.27" (845mm) of precipitation.

Ocean temperature

In Charlotte Amalie, the average seawater temperature is 81.3°F (27.4°C).
Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

The month with the shortest days is December, with an average of 11h of daylight.

Sunshine

Months with the least sunshine in Charlotte Amalie are November and December, with an average of 6.5h of sunshine.

UV index

Months with the highest UV index in Charlotte Amalie are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index in Charlotte Amalie. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: The daily maximum UV index of 7 in December interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Charlotte Amalie?

The average high-temperature, in December, in Charlotte Amalie, is 80.6°F (27°C), while the average low-temperature is 78.4°F (25.8°C). In December, the average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, is estimated at 84.7°F (29.3°C).

What is the least humid month in Charlotte Amalie?

January through March, October through December, with an average relative humidity of 75%, are the least humid months in Charlotte Amalie, United States Virgin Islands.

What is the average humidity in December in Charlotte Amalie?

In December, the average relative humidity in Charlotte Amalie, United States Virgin Islands, is 75%.

How much does it rain in Charlotte Amalie in December?

In Charlotte Amalie, United States Virgin Islands, in December, during 22.6 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

What is the water temperature in December in Charlotte Amalie?

In December, the average ocean temperature in Charlotte Amalie, United States Virgin Islands, is 81.3°F (27.4°C). Water temperature between 77°F (25°C) and 84.2°F (29°C) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

What is the month with the shortest days in Charlotte Amalie?

December has the shortest days of the year in Charlotte Amalie, with an average of 11h of daylight.

What is the average length of the day in December in Charlotte Amalie?

In December, the average length of the day in Charlotte Amalie is 11h.

What is the month with the least sunshine in Charlotte Amalie?

Months with the least sunshine in Charlotte Amalie are November and December, with an average of 6.5h of sunshine.

How many hours of sunshine does Charlotte Amalie have in December?

In December, the average sunshine in Charlotte Amalie is 6.5h.

When is the highest UV index in Charlotte Amalie?

January through December, with an average maximum UV index of 7, are months with the highest UV index.

When is the lowest UV index in Charlotte Amalie?

January through December, with an average maximum UV index of 7, are months with the lowest UV index.

What is the UV index intensity in December in Charlotte Amalie?

In Charlotte Amalie, the average daily maximum UV index in December is 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Charlotte Amalie, VI

Average temperature in December - Charlotte Amalie, VI
  • Average high temperature in December: 80.6°F

The warmest month (with the highest average high temperature) is September (84°F).
The month with the lowest average high temperature is March (78.4°F).

  • Average low temperature in December: 78.4°F

The month with the highest average low temperature is October (81.5°F).
The coldest month (with the lowest average low temperature) is March (75.7°F).

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Average pressure in December
Charlotte Amalie, VI

Average pressure in December - Charlotte Amalie, VI
  • Average pressure in December: 29.98"

Months with the highest atmospheric pressure are January and February (30.02").
Months with the lowest atmospheric pressure are October and November (29.91").

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Average wind speed in December
Charlotte Amalie, VI

Average wind speed in December - Charlotte Amalie, VI
  • Average wind speed in December: 14.7mph

The windiest month (with the highest average wind speed) is July (15mph).
The calmest month (with the lowest average wind speed) is October (11.1mph).

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Average humidity in December
Charlotte Amalie, VI

Average humidity in December - Charlotte Amalie, VI
  • Average humidity in December: 75%

Months with the highest relative humidity are May, June, July and August (78%).
Months with the lowest relative humidity are January, February, March, October, November and December (75%).

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Average rainfall in December
Charlotte Amalie, VI

Average rainfall in December - Charlotte Amalie, VI
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is September (4.45").
The driest month (with the least rainfall) is February (1.22").

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Average rainfall days in December
Charlotte Amalie, VI

Average rainfall days in December - Charlotte Amalie, VI
  • Average rainfall days in December: 22.6 days

The month with the highest number of rainy days is November (25.5 days).
Months with the least rainy days are February, March and June (18.2 days).

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Average sea temperature in December
Charlotte Amalie, VI

Average sea temperature in December - Charlotte Amalie, VI
  • Average sea temperature in December: 81.3°F

The best month for swimming (with the highest average sea temperature) is September (85°F).
The coldest month (with the lowest average sea temperature) is February (78.7°F).

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Average daylight in December /
Average sunshine in December
Charlotte Amalie, VI

Average daylight in December / Average sunshine in December - Charlotte Amalie, VI
  • Average daylight in December: 11h

The month with the longest days is June (Average daylight: 13.2h).
The month with the shortest days is December (Average daylight: 11h).

  • Average sunshine in December: 6.5h

The month with the most sunshine is June (Average sunshine: 10.5h).
Months with the least sunshine are November and December (Average sunshine: 6.5).

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Average sunshine days in December
Charlotte Amalie, VI

Average sunshine days in December - Charlotte Amalie, VI
  • Average sunshine days in December: 3.6 days

Months with the most sunshine days are March and April (7.3 days).
The month with the least sunshine days is November (2.4 days).

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Average UV index in December
Charlotte Amalie, VI

Average UV index in December - Charlotte Amalie, VI
  • Average UV index in December: 7

Months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).

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Average cloud cover in December
Charlotte Amalie, VI

Average cloud cover in December - Charlotte Amalie, VI
  • Average cloud cover in December: 39

Months with the most cloud cover are May and July (Cloud cover 40).
The month with the least cloud cover is February (Cloud cover 33).

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Average visibility in December
Charlotte Amalie, VI

Average visibility in December - Charlotte Amalie, VI
  • Average visibility in December: 6mi

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

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