December weather forecast
Hanko, Finland

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Weather in December

December welcomes a freezing winter in full force in Hanko. The city is hurled into sub-zero conditions with sea temperatures averaging around 4.3°C (39.7°F). The limited daylight confines most of the city's activity indoors, inducing a sense of hibernation. Hanko adorns a snowy blanket enhancing the magical holiday season. As the year-end approaches, a crisp winter chill becomes an integral part of the city's festive charm.

Sea temperature

In December, the average sea temperature is 4.3°C (39.7°F).
Note: For swimming, this is considered extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

Daylight

December has the shortest days of the year, with an average of 6h and 6min of daylight.
On the first day of December in Hanko, sunrise is at 09:02 and sunset at 15:32. On the last day of the month, sunrise is at 09:28 and sunset at 15:33 EET.

Frequently asked questions

How cold is the water in December in Hanko?

In Hanko, in December, the average water temperature is 4.3°C (39.7°F). 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 Hanko?

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

How many hours of daylight does Hanko have in December?

In Hanko, Finland, the average day length in December is 6h and 5min.

When are sunrise and sunset in December in Hanko?

On the first day of December in Hanko, Finland, sunrise is at 09:02 and sunset at 15:32. On the last day of the month, sunrise is at 09:28 and sunset at 15:33 EET.

Average sea temperature in December
Hanko, Finland

Average sea temperature in December - Hanko, Finland
  • Average sea temperature in December: 4.3°C

The best month for swimming (with the highest average sea temperature) is August (17.8°C).
The coldest month (with the lowest average sea temperature) is March (0.3°C).

Average daylight in December
Hanko, Finland

Average daylight in December - Hanko, Finland
  • Average daylight in December: 6h and 1min

The month with the longest days is June (Average daylight: 18h and 42min).
The month with the shortest days is December (Average daylight: 6h and 6min).

Hanko, Finland

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