Normality proves to be a very allusive concept but I have come to accept that the standard position of horizon is about one third up the cylindrical part of the light tower. The fishing hut at 8.5 km lies just inside the horizion and may be showing a little vertical compression.

This picture was taken in February when skies are clear but the air cold enough to avoid surface melting. Looming associated with the pooling of cold air will dissipate within an hour of sunrise and start reasserting itself in the hour before sunset. Looming horizons are associated with breakfast coffee or before diner drinks.
The standard horizion associates with the supposedly productive hours of the day when most people are working. The ice fisherman and cross country skiers will be out enjoying winter at it's best. Lots of sun ;not much wind but cool enough that the snow remains powdery (blue/green wax).

These conditions seem well represented by assuming a constant temperature gradient causing rays to bend toward the surface with a curvature of about 15% of the earth curvature. In a constant gradient all objects at a given distance experience exactly the same refraction so there is no magnification or distortion. Every part of a given object is elevated the same amount. Standard refraction for a camera height o f7.8 mtrs lifts the horizon .3' above the no gradient situation where light would travel in straight lines.