> the Netherlands
That's western Europe, not northern Europe[0]. You're welcome up north to enjoy our long comfortable summer evenings.
You're further west than Sweden, but the same timezone (CET), so you're already offset compared to the sun. Sweden is pretty spot on where UTC+1 follows the sun time[1], but as I already mentioned, I think modern people's schedules should be more important than when the sun is at its highest. I think UTC+1 would be good for you, UTC+2 would suit us better, and then countries in central and southern Europe could come to some agreement where to draw the line to avoid time zone enclaves.
If it's 30+° C I understand wanting to let it cool down, but I'd be damned if I live through these long dark winters and then have the long bright summer evenings taken from me.
[0] https://en.wikipedia.org/wiki/Northern_Europe#EuroVoc
[1] https://upload.wikimedia.org/wikipedia/commons/8/88/World_Ti...