I just checked the weather forecast for Helsinki next week.The weather has been around 0 degrees recently, but just as I arrive, the forecast says the skies will be blue and the temperature will be -10 degrees or lower.
The coat I was planning to take is ok for around -3, but I might have to take something a bit warmer, because I have to get from the airport to my hotel in Helsinki before I can buy warm clothes there.
Some random observations
Some things I see 
Maybe a normal coat will be enough if the buildings are heated.
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Yes, the buildings are heated, So is the transportation…The heavy coats are for -20. I have some good friends there if you are interested to meet new people. Let me know.
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