December weather forecast
Helsinki, Finland

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

The first month of the winter, December, is also a wintry month in Helsinki, Finland, with average temperature ranging between min -4.5°C (23.9°F) and max 0.5°C (32.9°F).

Temperature

In Helsinki, Finland, the average high-temperature marginally drops, from 3.7°C (38.7°F) in November, to a still wintry 0.5°C (32.9°F). In December, the average low-temperature is -4.5°C (23.9°F).

Rainfall

In Helsinki, during 20 rainfall days, 58mm (2.28") of precipitation is typically accumulated. In Helsinki, during the entire year, the rain falls for 182 days and collects up to 655mm (25.79") of precipitation.

Snowfall

Months with snowfall in Helsinki are January through March, November and December. During December, Helsinki regularly aggregates up to 120mm (4.72") of snow. Throughout the year, 740mm (29.13") of snow is accumulated.

Sea temperature

In December, the average sea temperature in Helsinki is 3°C (37.4°F).
Note: For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

Daylight

With an average of 6h of daylight, December has the shortest days of the year.

Sunshine

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

UV index

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 0. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the UV radiation for the average person.
Note: In December, the average maximum UV index of 0 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

How many days does it rain in December in Helsinki?

In Helsinki, during December, the rain falls for 20 days and regularly aggregates up to 58mm (2.28") of precipitation.

How much does it snow in Helsinki in December?

During December, Helsinki regularly aggregates up to 120mm (4.72") of snow.

How cold is the water in December in Helsinki?

In December, the average sea temperature in Helsinki, Finland, is 3°C (37.4°F). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the month with the shortest days in Helsinki?

With an average of 6h of daylight, December has the shortest days of the year in Helsinki.

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

The average length of the day in December is 6h.

What is the month with the least sunshine in Helsinki?

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

How long on average sun shines in December in Helsinki?

The average sunshine in December in Helsinki, Finland, is 0.9h.

When is the lowest UV index in Helsinki?

Months with the lowest UV index in Helsinki are January, February, November and December, with an average maximum UV index of 0.

What is the UV index reading in December in Helsinki?

In Helsinki, Finland, the average daily maximum UV index in December is 0. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.

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).
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).
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

The month with the longest days is June (Average daylight: 18.8h).
The month with the shortest days is December (Average daylight: 6h).

  • Average sunshine in December: 0.9h

The month with the most sunshine is June (Average sunshine: 9.9h).
The month with the least sunshine is December (Average sunshine: 0.9h).

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Average UV index in December
Helsinki, Finland

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

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

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