December weather forecastVaasa, Finland

Weather in December

The weather conditions in Vaasa culminate in December, marking the onset of the coldest period. Temperatures can drop as low as -9°C (15.8°F). Daylight is at its yearly minimum, casting the city in a long, frigid twilight. Regular precipitation is most likely to fall as snow, blanketing Vaasa in its festive winter cover. As December ends, so does the cycle of weather patterns in Vaasa, setting the stage for a new year of changing climates.

Temperature

The beginning of December in Vaasa brings a slight decrease in the average high-temperature, transitioning from a cold 1°C (33.8°F) in November to a subzero cold -3°C (26.6°F). Vaasa's nighttime temperature in December drops to an average of -9°C (15.8°F).

Rainfall

In December, the rain falls for 19 days. Throughout December, 39mm (1.54") of precipitation is accumulated. In Vaasa, during the entire year, the rain falls for 182 days and collects up to 493mm (19.41") of precipitation.

Sea temperature

In Vaasa, the average seawater temperature in December is 2.4°C (36.3°F).
Note: When swimming, this state is excessively cold, posing a lethal risk. Absent the protection of insulated waterproof wear, hypothermia is likely to occur immediately.

Daylight

December has the shortest days of the year, with an average of 4h and 54min of daylight.
On the first day of December, sunrise is at 09:39 and sunset at 15:05. On the last day of the month, sunrise is at 10:10 and sunset at 15:03 EET.

Sunshine

January and December, with an average of 0h of sunshine, are months with the least sunshine in Vaasa.

UV index

The months with the lowest UV index in Vaasa are January, February, November and December, with an average maximum UV index of 0. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index, 0 in December, converts into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.