Hi Thorarinna, hope all is well in Iceland and that Volcano no one can pronounce the name of is doing you no harm.
As for wind on Lakes, I have found here in NZ the fish always face the wind when Feeding. The only time I have ever seen fish feeding with the wiind behind them is when there is a strong current, like a River or stream flowing in to the lake. I believe mostly that the trout will feed while moving upwind for a while then swim downwind and start feeding again upwind.
Hope all your Fish are big ones!
All the best.
Mike.