December weather forecast
Saint John, VI

Beautiful scenery with green vegetation and the vast blue water around the islands in St John, Virgin Islands
Beautiful scenery with green vegetation and the vast blue water around the islands in St John, Virgin Islands

Weather in December

The first month of the winter, December, is still a warm month in Saint John, United States Virgin Islands, with an average temperature fluctuating between 71.6°F (22°C) and 82.4°F (28°C).

Temperature

The coldest months are January through March and December, with an average high-temperature of 82.4°F (28°C).

Rainfall

In Saint John, United States Virgin Islands, during December, the rain falls for 14 days and regularly aggregates up to 4.69" (119mm) of precipitation. Throughout the year, in Saint John, there are 156 rainfall days, and 49.69" (1262mm) of precipitation is accumulated.

Ocean temperature

In Saint John, the average seawater temperature in December is 80.6°F (27°C).
Note: For swimming, diving, and other water activities, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The month with the shortest days is December, with an average of 11h and 3min of daylight.
On the first day of the month, sunrise is at 6:34 am and sunset at 5:41 pm. On the last day of December, in Saint John, sunrise is at 6:50 am and sunset at 5:53 pm AST.

Sunshine

November and December, with an average of 7h of sunshine, are months with the least sunshine in Saint John.

UV index

With an average maximum UV index of 7, December is the month with the lowest UV index in Saint John. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 7 in December transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What are the coldest months in Saint John?

January through March and December, with an average high-temperature of 82.4°F (28°C), are the coldest months.

What is the temperature in December in Saint John?

In Saint John, United States Virgin Islands, in December, the average high-temperature is 82.4°F (28°C), and the average low-temperature is 71.6°F (22°C).

How much does it rain in Saint John in December?

In Saint John, United States Virgin Islands, during December, the rain falls for 14 days and regularly aggregates up to 4.69" (119mm) of precipitation.

What is the water temperature in December in Saint John?

In Saint John, United States Virgin Islands, the average seawater temperature in December is 80.6°F (27°C). For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.

What is the month with the shortest days in Saint John?

December has the shortest days of the year in Saint John, with an average of 11h and 3min of daylight.

How many hours of daylight does Saint John have in December?

The average day length in December is 11h and 3min.

When are sunrise and sunset in December in Saint John?

In December, on the first day of the month, sunrise is at 6:34 am and sunset at 5:41 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 5:53 pm AST.

What is the month with the least sunshine in Saint John?

November and December, with an average of 7h of sunshine, are months with the least sunshine.

How many hours of sunshine does Saint John have in December?

In Saint John, United States Virgin Islands, the average sunshine duration in December is 7h.

When is the lowest UV index in Saint John?

With an average maximum UV index of 7, December is the month with the lowest UV index in Saint John, United States Virgin Islands.

What is the UV index reading in December in Saint John?

The average daily maximum UV index in December is 7. A UV Index value of 6 to 7 symbolizes a high health risk from unprotected exposure to UV radiation.
Average rainfall days
Average sunshine
Average UV index

Average temperature in December
Saint John, VI

Average temperature in December - Saint John, VI
  • Average high temperature in December: 82°F

The warmest months (with the highest average high temperature) are August and September (88°F).
The months with the lowest average high temperature are January, February, March and December (82°F).

  • Average low temperature in December: 72°F

The months with the highest average low temperature are June, July, August, September and October (75°F).
The coldest months (with the lowest average low temperature) are January, February and March (70°F).

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Average rainfall in December
Saint John, VI

Average rainfall in December - Saint John, VI
  • Average rainfall in December: 4.7"

The wettest months (with the highest rainfall) are October and November (6.3").
The driest month (with the least rainfall) is February (2.1").

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Average rainfall days in December
Saint John, VI

Average rainfall days in December - Saint John, VI
  • Average rainfall days in December: 14 days

The months with the highest number of rainy days are September and October (16 days).
The month with the least rainy days is April (9 days).

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Average sea temperature in December
Saint John, VI

Average sea temperature in December - Saint John, VI
  • Average sea temperature in December: 81°F

The best months for swimming (with the highest average sea temperature) are September and October (84°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (79°F).

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Average daylight in December /
Average sunshine in December
Saint John, VI

Average daylight in December / Average sunshine in December - Saint John, VI
  • Average daylight in December: 11h and 3min

The month with the longest days is June (Average daylight: 13h and 13min).
The month with the shortest days is December (Average daylight: 11h and 3min).

  • Average sunshine in December: 7h

The months with the most sunshine are March, April, July and August (Average sunshine: 9h).
The months with the least sunshine are November and December (Average sunshine: 7h).

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Average UV index in December
Saint John, VI

Average UV index in December - Saint John, VI
  • Average UV index in December: 7

The months with the highest UV index are March, April, May, June, July, August and September (UV index 12).
The month with the lowest UV index is December (UV index 7).

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