Sorry, wrong place to post again
now I found where the TTD problem board is.
sorry about that
Your misconception is that you play Transport Tycoon Deluxe (TTD). You don't. You play OpenTTD. That's a different game.
EDIT: Only activate those NewGRFs which you know what they do. It usually helps. And no: we certainly won't start guessing which NewGRFs you might have activated and which then in turn might be the culprit. A wild guess would be on the "arctic remove snow" NewGRF
But you're not that lazy to not have look through your active list and randomly ask why you have no snow, expecting crystall balls to work, right?