December weather forecast
St. John's, Canada

December in St. John's welcomes the winter season, featuring amplifying cold temperatures and snowfall. The high temperature drops to 1.8°C (35.2°F), while the low plunges to a chilly -4.7°C (23.5°F). Days become significantly shorter as daylight ticks away earlier. Winter wardrobe essentials claim their spot, and around corners, residents bundle up in warm clothing. Despite the crisp winter air, the festive fervor keeps the city alive.

Temperature

The transition to December in St. John's results in a modest reduction in average high-temperature, moving from a frosty 6.4°C (43.5°F) in November to an icy 1.8°C (35.2°F). Throughout December, St. John's's nights cool down to an average of -4.7°C (23.5°F).

Rainfall

In St. John's, in December, during 12.7 rainfall days, 103mm (4.06") of precipitation is typically accumulated. In St. John's, during the entire year, the rain falls for 162.7 days and collects up to 1207mm (47.52") of precipitation.

Snowfall

Months with snowfall in St. John's, Canada, are January through June, October through December. In St. John's, in December, during 14.6 snowfall days, 634mm (24.96") of snow is typically accumulated. In St. John's, during the entire year, snow falls for 79 days and aggregates up to 3349mm (131.85") of snow.

Sea temperature

In December, the average sea temperature in St. John's, Canada, is 2.6°C (36.7°F).
Note: In the realm of swimming, this state is extremely cold, treacherous, and life-threatening. Without properly insulated waterproof clothing, hypothermia develops almost immediately.

Daylight

With an average of 8h and 30min of daylight, December has the shortest days of the year in St. John's.
On the first day of the month, sunrise is at 7:28 am and sunset at 4:11 pm. On the last day of December, in St. John's, sunrise is at 7:48 am and sunset at 4:19 pm NST.

Sunshine

The month with the least sunshine in St. John's is December, with an average of 2h of sunshine.

UV index

The months with the lowest UV index in St. John's are January, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, the maximum UV index of 1 suggests this advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.