Yes, it is very very cold. We got some freezing air from Siberia over the whole of Finland this week and the minus temperatures have been quite scary... The last winters in Helsinki have been so mild, it is hard to adjust. Although, I do remember this from my childhood. A bit too well, even.
(When I lived in D.C. people often said. "Oh, but you must be suffering for the heat wave!" As often I responded: "Oh, no! I am enjoying it." HA HA!)
I have taken summery pics of the Southern parts of Helsinki, near my work before (here and here) . So, here's two pics from today. I think i just missed the best light and it was too cold to take them, but still it's something to remember in July, I guess.