December weather forecast
Vaasa, Finland

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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.

Frequently asked questions

How cold is it in Vaasa in December?

In Vaasa, -3°C (26.6°F) is the average high-temperature and -9°C (15.8°F) is the average low-temperature during December.

How many days does it rain in December in Vaasa?

In Vaasa, in December, during 19 rainfall days, 39mm (1.54") of precipitation is typically accumulated.

What is the sea temperature in December in Vaasa?

In Vaasa, Finland, in December, the average water temperature is 2.4°C (36.3°F). For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

What is the month with the shortest days in Vaasa?

With an average of 4h and 54min of daylight, December has the shortest days of the year.

What is the average length of the day in December in Vaasa?

In December, the average day length is 4h and 54min.

When are sunrise and sunset in December in Vaasa?

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.

What are the months with the least sunshine in Vaasa?

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

How long on average sun shines in December in Vaasa?

In Vaasa, Finland, the average sunshine duration in December is 0h.

When is the lowest UV index in Vaasa?

The months with the lowest UV index in Vaasa, Finland, are January, February, November and December, with an average maximum UV index of 0.

What is the UV index intensity in December in Vaasa?

The average daily maximum UV index in December in Vaasa is 0. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from exposure to Sun's UV rays.
Average high temperature
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Vaasa, Finland

Average temperature in December - Vaasa, Finland
  • Average high temperature in December: -3°C

The warmest month (with the highest average high temperature) is July (20°C).
The months with the lowest average high temperature are January and February (-5°C).

  • Average low temperature in December: -9°C

The month with the highest average low temperature is July (11°C).
The coldest months (with the lowest average low temperature) are January and February (-12°C).

Average rainfall in December
Vaasa, Finland

Average rainfall in December - Vaasa, Finland
  • Average rainfall in December: 39mm

The wettest month (with the highest rainfall) is August (62mm).
The driest month (with the least rainfall) is February (23mm).

Average rainfall days in December
Vaasa, Finland

Average rainfall days in December - Vaasa, Finland
  • Average rainfall days in December: 19 days

The month with the highest number of rainy days is January (21 days).
The months with the least rainy days are May and June (11 days).

Average sea temperature in December
Vaasa, Finland

Average sea temperature in December - Vaasa, Finland
  • Average sea temperature in December: 2.4°C

The best month for swimming (with the highest average sea temperature) is August (16.4°C).
The coldest month (with the lowest average sea temperature) is February (-0.3°C).

Average daylight in December /
Average sunshine in December
Vaasa, Finland

Average daylight in December / Average sunshine in December - Vaasa, Finland
  • Average daylight in December: 4h and 5min

The month with the longest days is June (Average daylight: 20h and 6min).
The month with the shortest days is December (Average daylight: 4h and 54min).

  • Average sunshine in December: 0h

The month with the most sunshine is June (Average sunshine: 9h).
The months with the least sunshine are January and December (Average sunshine: 0h).

Average UV index in December
Vaasa, Finland

Average UV index in December - Vaasa, Finland
  • Average UV index in December: 0

The month with the highest UV index is June (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 0).

Vaasa, Finland

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