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 (32.9°F) at their highest, winter coats become a necessity. A significant increase in snowfall amplifying to 120mm (4.72") 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

The transition into December in Helsinki subtly indicates a reduction in the average high-temperature, down to a still wintry 0.5°C (32.9°F) from November's icy 3.7°C (38.7°F). A minor drop in temperature is observed from daytime highs during the nights of December, averaging a freezing cold -4.5°C (23.9°F).

Rainfall

In Helsinki, Finland, in December, it is raining for 20 days, with typically 58mm (2.28") of accumulated precipitation. 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 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 Helsinki, in December, the average water temperature is 3°C (37.4°F).
Note: In swimming, this condition is considered life-threatening and perilous. The painful sensation of cold water leads to immediate hyperventilation. Utilizing a specialized swimsuit is critical to reduce thermal injury.

Daylight

The month with the shortest days is December, with an average of 6h and 0min of daylight.
On the first day of December, sunrise is at 08:57 and sunset at 15:21. On the last day of the month, sunrise is at 09:24 and sunset at 15:22 EET.

Sunshine

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

UV index

The months with the lowest UV index in Helsinki, Finland, are January, February, November and December, with an average maximum UV index of 0. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 0 during December leads to these instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.

Frequently asked questions

How cold is it in Helsinki in December?

In Helsinki, 0.5°C (32.9°F) is the average high-temperature and -4.5°C (23.9°F) is the average low-temperature during December.

How many days does it rain in December in Helsinki?

In December, in Helsinki, Finland, the rain falls for 20 days. Throughout December, 58mm (2.28") of precipitation is accumulated.

How much does it snow in Helsinki in December?

In Helsinki, Finland, in December, 120mm (4.72") of snow is typically accumulated.

How cold is the water in December in Helsinki?

In Helsinki, Finland, the average seawater temperature in December 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?

December has the shortest days of the year, with an average of 6h and 0min of daylight.

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

The average day length in December in Helsinki, Finland, is 5h and 59min.

When are sunrise and sunset in December in Helsinki?

In December, on the first day of the month, sunrise is at 08:57 and sunset at 15:21. On the last day of the month, in Helsinki, Finland, sunrise is at 09:24 and sunset at 15:22 EET.

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.

How many hours of sunshine does Helsinki have in December?

In December, the average sunshine duration is 0.9h.

What is the month with the lowest UV index in Helsinki?

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

What is the UV index reading in December in Helsinki?

In December, the average daily maximum UV index in Helsinki, Finland, is 0. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's UV radiation.
Average rainfall days
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).

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).

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).

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).

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).

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).

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).

Helsinki, Finland

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