Hi Sergej!

I think that it's better to put "-" when the temperature is negative, because you write to italians.......Many of them can understand that you still have positive temperatures if you don't put anything.....but the reality is different........(I can understand that you have others uses at Norilsk, but in the rest of the world....)

Excuse me if I write sincerly that I think....

Hot here in Beirut, but I expect rain tomorrow

Ciao!
AE