December weather forecast
Helsinki, Finland

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A scenic reflection in the water of the illuminated city of Helsinki in Finland
A scenic reflection in the water of the illuminated city of Helsinki in Finland

Weather in December

With December, Helsinki embraces the full onset of winter and the festive season. As temperatures dive to the lower side, peaking only at 0.5°C at their highest, winter coats become a necessity. A significant increase in snowfall amplifying to 120mm paints the city in a winter wonderland motif. Brief daylight hours reminiscent of January's patterns coupled with scanty sunshine encapsulates the hushed calmness of Finnish winter. Amidst the chilling temperatures, December in Helsinki carries its unique winter charm and festive spirit.

Temperature

Helsinki experiences a moderate temperature shift at the start of December, with average high-temperatures adjusting a bit from 3.7°C in November to a still cold 0.5°C. December nights witness a slight temperature decrease, averaging at a subzero cold -4.5°C.

Rainfall

In Helsinki, during December, the rain falls for 20 days and regularly aggregates up to 58mm of precipitation. In Helsinki, during the entire year, the rain falls for 182 days and collects up to 655mm of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Helsinki, in December, 120mm of snow is typically accumulated. Throughout the year, 740mm of snow is accumulated.

Sea temperature

In December, the average sea temperature in Helsinki is 3°C.
Note: In swimming situations, the extreme cold and danger can lead to fatality. Without the protection of insulated waterproof gear, hypothermia takes effect quickly.

Daylight

With an average of 6h and 0min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 08:55 and sunset at 15:22. On the last day of December, sunrise is at 09:24 and sunset at 15:21 EET.

Sunshine

With an average of 0.9h of sunshine, December has the least sunshine of the year in Helsinki.

UV index

January, February, November and December, with an average maximum UV index of 0, are months with the lowest UV index in Helsinki. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 0 translates into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
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FAQ

How cold is December in Helsinki?

In Helsinki, in December, the average high-temperature is 0.5°C, and the average low-temperature is -4.5°C.

How much does it rain in Helsinki in December?

In Helsinki, in December, during 20 rainfall days, 58mm of precipitation is typically accumulated.

How much does it snow in Helsinki in December?

During December, Helsinki regularly aggregates up to 120mm of snow.

What is the sea temperature in December in Helsinki?

In December, the average sea temperature is 3°C. For swimming, this is considered life-threatening and very dangerous. The water feels painfully cold, and hyperventilation quickly occurs. A specialized swimsuit is mandatory to reduce thermal damage.

What is the month with the shortest days in Helsinki?

The month with the shortest days is December, with an average of 6h and 0min of daylight.

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

In December, the average day length in Helsinki is 5h and 59min.

What time are sunrise and sunset in December in Helsinki?

In December, on the first day of the month, sunrise is at 08:55 and sunset at 15:22. On the last day of the month, in Helsinki, Finland, sunrise is at 09:24 and sunset at 15:21 EET.

What is the month with the least sunshine in Helsinki?

December has the least sunshine of the year in Helsinki, with an average of 0.9h of sunshine.

How many hours of sunshine does Helsinki have in December?

In Helsinki, Finland, the average sunshine duration in December is 0.9h.

What are the months with the lowest UV index in Helsinki?

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

What is the UV index reading in December in Helsinki?

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

Average temperature in December
Helsinki, Finland

Average temperature in December - Helsinki, Finland
  • Average high temperature in December: 0.5°C

The warmest month (with the highest average high temperature) is July (21.5°C).
The month with the lowest average high temperature is February (-1.9°C).

  • Average low temperature in December: -4.5°C

The month with the highest average low temperature is July (14.2°C).
The coldest month (with the lowest average low temperature) is February (-7.4°C).

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Average rainfall in December
Helsinki, Finland

Average rainfall in December - Helsinki, Finland
  • Average rainfall in December: 58mm

The wettest month (with the highest rainfall) is August (80mm).
The driest month (with the least rainfall) is April (32mm).

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Average rainfall days in December
Helsinki, Finland

Average rainfall days in December - Helsinki, Finland
  • Average rainfall days in December: 20 days

The month with the highest number of rainy days is December (20 days).
The months with the least rainy days are April and May (11 days).

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Average snowfall in December
Helsinki, Finland

Average snowfall in December - Helsinki, Finland
  • Average snowfall in December: 120mm

The month with the highest snowfall is February (230mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).

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Average sea temperature in December
Helsinki, Finland

Average sea temperature in December - Helsinki, Finland
  • Average sea temperature in December: 3°C

The best month for swimming (with the highest average sea temperature) is August (16°C).
The coldest months (with the lowest average sea temperature) are February and March (1°C).

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

Average daylight in December / Average sunshine in December - Helsinki, Finland
  • Average daylight in December: 6h and 0min

The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).

  • Average sunshine in December: 0h and 5min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is December (Average sunshine: 0h and 54min).

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Average UV index in December
Helsinki, Finland

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

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

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Helsinki, Finland

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