Might have been less fun if it had been in the depths of winter. The fact that it was a balmy sunny day in springtime made it a pleasantly novel experience, I agree. Of course, the "sunny day" seems to have been correlated.
We're talking about Spain. How bad could a winter really be?
It can get pretty bad https://en.wikipedia.org/wiki/Storm_Filomena
Spain is more than Barcelona or Valencia. Both the North and the inner part of the country can have crude winters, specially in the mountains. The temperatures range between -22 and 116 Fahrenheit depending on the location. For comparison, Chicago minimum is -25 F, so even if the mean is lower there, some places can be still very cold. Is one of the most diverse countries in Europe.