Every winter you'll see the same phenomenon unfold in Amsterdam (and basically anywhere else in the country): the Dutch desperately seeking refuge on the terraces.
A people desperate for a shot of UV, specially near the end of a long, cold and dark winter, a real winter.
This one being the record-braker that it was, last weekend the sight of Amsterdammers scrambling for their spot in the sun must have triggered the curiosity of many visitors: "How can these people sit outside? It's freezing!!"
Oh, and of course they will get to their place in the sun by bicycle. You could call that instrumental for a full recovery...and dream of the end of winter. And when you let people on bicycles be your seasonal talisman, you'd be convinced spring had already arrived ;).