Climate - Finland

The climate in detail

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• The seasons
• Lapland - Rovaniemi
• Center-south - Oulu, Helsinki
• When to go
• What to pack

The seasons

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Winter is long and very cold in much of Finland. It lasts more than four months even in Helsinki, which lies in the far south. Here, the temperature remains almost constantly around or below freezing (0 °C or 32 °F) from mid-November to late March.
As you head north and east, winter gets even colder and longer. The numerous lakes that are located in Finland are frozen, and even the sea can sometimes freeze (more often in the Gulf of Bothnia, but sometimes, even in the port of Helsinki and in the eastern part of the Gulf of Finland), and it is necessary to resort to icebreakers to allow maritime traffic to continue.
The average temperature in January and February is around -13 °C (8.5 °F) in the north, in Lapland, around -8.5 °C (16.5 °F) in Kuopio, in the central inland areas, around -4.5 °C (24 °F) in Helsinki, on the south coast, while it is only around -1.5 °C (29.5 °F) in the mildest areas of the southwest (see the Åland islands).

Anyway, during winter, weather conditions can vary a lot. When Finland is affected by cold air masses from neighbouring Russia, the temperature drops below -20 °C (-4 °F). On colder periods, the temperature can fall as low as -50 °C (-58 °F) in the far north (Lapland). In January 1987, it reached -36 °C (-33 °F) even in the "southern" city of Helsinki.
On the contrary, when the country is reached by mild winds from the Atlantic Ocean, the temperature can slightly exceed the freezing point in the center and south.

The thaw usually occurs in late March in the south and during the month of April in the center-north. In autumn, snow normally begins to fall in October in Lapland, and in November in the south.

Summer in Finland is mild or pleasantly warm, although it can sometimes get cold at night. The rains are quite frequent. Average temperatures range from 14/15 °C (57/59 °F) in the north to 18 °C (64.5 °F) in the south and in Helsinki.
However, there can sometimes be short, hot periods. The highest records are around 31/32 °C (88/90 °F) in Lapland and 33/34 °C (91/93 °F) in the center-south.

Lapland

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In Lapland, the northernmost part of Finland, the climate is cold for most of the year, with a short and intense summer. Here, the winter (which in Nordic countries is the season when the temperature remains below freezing) lasts seven months, from October to April. The days are very short from November to January, and in December, you almost never see the sun, also because of the cloud cover.
Summer is mild, with some warm days, while at night, it can get cold. July is the warmest month. In summer, the days are very long: in June and July, there's the midnight sun, while in August, even though the days begin to shorten, it never gets completely dark. The temperature steadily exceeds freezing only in the three summer months, from June to August. In this season, the vegetation grows rapidly, to take advantage of the short period of mild temperatures, while mosquitoes literally invade the landscape.

Rovaniemi

Rovaniemi, the capital of Lapland, is practically located at the polar circle, in the southern part of the region.
The coldest record is -47.5 °C (-53.5 °F) and was set in January 1999.
During summer, occasionally there are periods when the temperature can reach 28/30 °C (82/86 °F), but in other periods, it can drop below 5 °C (41 °F) at night. Here are the average temperatures.

In Rovaniemi, precipitation amounts to 555 mm (21.5 in) per year. The wettest season is summer.

The sun in Rovaniemi does not set at all from around June 7 to July 6. On the contrary, in winter, there is no period when the sun never rises (around December 22, the sun is slightly above the horizon for about 2 hours and a quarter). However, given the briefness of the days and the frequency of cloud cover, in winter the sun is almost never seen, while in June and July, it shines roughly 37% of the time. Here are the average sunshine hours per day.

Center-south

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In the center-south, winter is less cold than in Lapland; however, it remains freezing, with averages well below 0 °C (32 °F). The Gulf of Bothnia, especially in the northern part, is not able to temper the climate by much because in winter it is often frozen. Summer is mild or pleasantly warm, and a little warmer than in the north, especially at night.

Oulu

In Oulu, on the coast of the northern part of the Gulf of Bothnia, 170 km (105 mi) south of Rovaniemi, the average February temperature is -8.7 °C (16.3 °F). Here, the temperature dropped to -37.5 °C (-35.5 °F) in January 1987. Here are the average temperatures.

In Oulu, 520 mm (20.5 in) of rain or snow fall per year. As usual, precipitation is well distributed throughout the year, at least as regards to the frequency, while July and August are the months when the rains are more abundant. Here is the average precipitation.

In Oulu, the sea temperature from January to April is near the freezing point (remember that the sea freezes at about -2 °C or 28.5 °F). In summer, the sea remains cold.

Further south, in Kuopio (in the interior), the climate is similar to that of Oulu, while in Vaasa (on the coast), it is slightly milder.
Further south, in Tampere, located in the inland southern area, the average temperature ranges from -6 °C (21 °F) in February to 17 °C (62.5 °F) in July.

Helsinki

The capital, Helsinki, is located in the southernmost part of the country. However, the temperature remains around or below freezing for a few months every year. Here are the average temperatures.

In Helsinki, precipitation amounts to 675 mm (26.5 in) per year. Here is the average precipitation.

The sun in Helsinki is rarely seen from November to January, while from May to August, it shines about half the time (compared to the length of the day).

The sea in Helsinki is a little less cold than in the Gulf of Bothnia, but as mentioned, it can sometimes freeze here as well. In summer, the sea remains cold; however, it reaches 17 °C (63 °F) in August.



In Turku, on the coast exposed to the south-west, the climate is similar to that of Helsinki.

When to go

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Summer, from June to August, is the best season to visit Finland. Temperatures are generally good for outdoor activities, hovering around 18/22 °C (64/72 °F), at least when it doesn't rain (in the evening or during rainy days it can be cooler), while it rarely gets hot. However, sometimes at night it can get cold, especially in Lapland.
The days are very long, especially in June, when you can admire the "white nights" in the south, and the midnight sun in the north. June is not as rainy as July, but it's a bit cooler.
It is worth while to recall that in Nordic countries the summer generally begins to decline by mid-August: the days get shorter (even though they remain long), and are both a slight decrease in temperature and an increase in the number of rainy days.
The sun in Finland does not shine very often, even in summer, when there can be some rainy or cloudy days, but at least, the sky is not always overcast in this season, and the sun often peeks through the clouds.

If you want to visit Finland in its winter appearance, the best month is March, when the country is still covered with snow (at least in the center-north, while in the south it depends on the years), but the temperature is milder, and the days are longer than in the previous months.
Easter can be a good period, even when it is advanced, to go cross-country skiing in the north and to take advantage of the longer days, while hoping for the sun to come out.
In the period from December to February, in addition to very short days (in the Christmas period, the sun doesn't even rise in the north), sometimes, there can be a bitter cold, even in the south, especially in January and February. In this period, however, you can experience the polar nights in the north and go in search of the northern lights (Aurora borealis). In February, the days are a bit longer.

What to pack

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In winter: bring cold weather clothing, synthetic, thermal long underwear, a fleece, a parka, a wind jacket, gloves, and warm boots.
In summer: bring clothes for spring and autumn, being ready to add or remove the outer layer, a T-shirt, but also long pants, a jacket, a sweatshirt or sweater, and a raincoat or umbrella.

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