December weather forecast
Saint John, VI

Closing the year, December in Saint John brings the cool breath of winter mixed with a tropical climate. The slower pace of the city matches the gentle coolness in the air. While the temperature sees a minor dip, December’s significant change lies in its reduced rainfall, going down to 4.7" (119mm). Captivating locals and tourists alike, Saint John’s December weather, with its mix of warm days and cool nights, provides an ideal setting for holiday festivities and year-end celebrations.

Temperature

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

Rainfall

In December, the rain falls for 14 days. Throughout December, 4.69" (119mm) of precipitation is accumulated. In Saint John, during the entire year, the rain falls for 156 days and collects up to 49.69" (1262mm) of precipitation.

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

With an average of 11h and 6min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:35 am and sunset at 5:41 pm. On the last day of December, sunrise is at 6:50 am and sunset at 5:53 pm AST.

Sunshine

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

UV index

With an average maximum UV index of 7, December is the month with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index, 7 during December, leads to the following recommendations:
Persist with safeguards and heed sun safety doctrines. Keeping sunburn at bay is of prime importance. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Be careful! The Sun's UV radiation is accentuated by reflecting off sand and water.