"Polar night" is one of the phrases journalists reach for first when they write about Lapland in winter, and one of the easiest to get wrong. Rovaniemi is famous for its dark season, but strictly speaking it sits just south of the area where the sun stays below the horizon for whole days. The truth is more interesting than the slogan: a very short, blue day, and a long twilight either side of it.

We live in Rovaniemi and work in Lapland tourism, so we spend every December in this light. This guide gives you precise, sourced figures for sunrise, sunset and twilight, explains where genuine polar night begins, and describes what the dark season does to daily life and mood, using research rather than folklore.

What kaamos actually means

Kaamos is the Finnish word for the polar night, the period around midwinter when the sun does not rise above the horizon at all. Visit Rovaniemi uses the term warmly: its polar night page describes the "blue wonders" of the dark season, when the sun does not appear above the horizon in late December and the landscape is bathed in blue and pink light.

Technically, the geometry is simple. True polar night requires the sun to stay below the horizon at midday, which at the winter solstice happens only north of roughly 67.4° N once the bending of light in the atmosphere is taken into account. Rovaniemi is at 66.5° N. At noon on the shortest day, the centre of the sun is only about 0.06 degrees above the geometric horizon, so the sun does rise, but only just. In practice, trees, hills and cloud mean that many days at midwinter show no visible sun at all, which is why the town looks and feels like a polar-night place.

The word has also given Finnish a medical-sounding compound, kaamosmasennus, "kaamos depression", which researchers use for seasonal low mood in the dark months; we return to the evidence below. It is a good reminder that for Finns kaamos is as much a state of mind and a rhythm of life as an astronomical term.

The safest wording for a script is: "Rovaniemi has almost no sun in midwinter, but not true polar night; that begins further north."

Rovaniemi's light in numbers

The table shows a standard solar calculation for Rovaniemi (sunrise-sunset.org, coordinates 66.50° N, 25.73° E, Helsinki time) for three dates in winter 2026–27. Civil twilight is the period when the sun is within six degrees of the horizon, when it is still light enough for most outdoor activity without artificial light.

On 21 December the same calculation gives nautical twilight from about 07:57 to 16:34 and astronomical twilight from about 06:50 to 17:40. For comparison, FMI's 1991–2020 normal for December sunshine at the Rovaniemi airport is only about three hours across the entire month, because most days are cloudy.

Where true polar night begins

For a journalist who needs the real polar night, the filming locations are further north. Using the same kind of solar calculation, we estimate that the sun stays below the horizon for roughly the following periods in winter 2026–27. These are our own calculations, accurate to within a day or two, and you should confirm exact dates with the Finnish Meteorological Institute or a solar calculator before broadcast.

The blue moment

The colours are what visitors remember. Visit Rovaniemi explains that the polar night is not completely dark: even when the sun is below the horizon, sunlight reaches the upper atmosphere and creates hues like a sunset. Locals, it says, often call the short midday window the "blue moment", a Finnish alternative to the photographers' "blue hour", and snow takes on subtle blue shades under that light. The same page notes that Rovaniemi has around five months of snow each year.

Our own advice for anyone filming or photographing the blue moment is to plan it around late morning to early afternoon, to allow for cold-weather battery loss, and to use a local guide because the best viewpoints are often a short drive from the town. For safety on cold days, see our guide to how cold Lapland really is.

Mood and daily life in the dark season

The most common question we hear from journalists is whether the dark season is depressing. The research answer is nuanced. A study from the University of Eastern Finland, published in 2023 and funded by the Research Council of Finland, analysed 636,543 mental-health-related sick leaves over 12 years from the register of Kela, the Finnish social insurance institution. It found a clear increase in sick days due to depression, anxiety and sleep disorders in October and November, when the number of sick days was almost twice as high as in summer. Notably, the peak was in late autumn rather than at midwinter, and the researchers cautioned that other explanations, such as workplace stress in the autumn, are possible.

The same article notes that some people experience winter depression, known as seasonal affective disorder, with symptoms such as increased appetite, weight gain and excess sleepiness. Timo Partonen, a research professor at the Finnish Institute for Health and Welfare, is quoted as saying the symptoms can often be alleviated through bright light therapy. If you or a family member struggles with mood in winter, speak to a doctor; this is general information, not medical advice.

What locals do, in our experience, is organise life around the light rather than fight it. We go outdoors at midday, keep candles and warm lamps on indoors, meet friends for sauna and coffee, and accept that the evening starts early. Visitors usually stay for days rather than months, and in our experience most find the blue light a pleasure rather than a burden.

Seeing the dark season as a visitor

The same long nights give you the best chance of seeing the aurora, and the activity most people choose for it is a guided evening outing. The Northern Lights Tour at the Campfire5% off · HUNGRYTRAVELFAMILY5 lasts about three hours, includes an English-speaking guide, winter clothing and snacks and drinks by the campfire, and starts from €99 per adult, checked November 2026. Prices change, so check before booking. No operator can guarantee northern lights; they depend on solar activity and clear skies. Type HUNGRYTRAVELFAMILY5 at checkout for 5% off.

Check dates and prices for the Northern Lights Tour at the Campfire →

If you are comparing months, we have written about the early part of the dark season in our guide to Rovaniemi in November.

Notes for journalists

Three suggestions. First, avoid "24 hours of darkness" for Rovaniemi: say "a few hours of twilight-blue daylight". Second, specify whether you mean sunrise to sunset or the usable light including twilight. Third, if you need genuine polar night footage, choose a location north of about 67.4° N and check the dates for that place. We are happy to help journalists with local context; our press page explains how: Hungrytravelfamily press and media.

FAQ

Does Rovaniemi have polar night?

Not in the strict sense. The sun rises briefly even at midwinter; around 21 December 2026 sunrise is at about 11:07 and sunset at about 13:23. True polar night begins north of roughly 67.4° N.

What does kaamos mean?

Kaamos is the Finnish word for the polar night. In Lapland it is also used loosely for the dark midwinter weeks.

How many hours of daylight does Rovaniemi have at Christmas?

About two to three hours between sunrise and sunset in late December, with civil twilight extending the usable light to about six hours around the solstice.

Is the dark season bad for mental health?

Research from the University of Eastern Finland found sick leaves for depression, anxiety and sleep disorders peak in October and November, and some people experience winter depression that bright light therapy can often relieve. Speak to a doctor if you are affected.