Climate and average monthly weather data for Zugspitze, Germany displayed in a beautiful overview. Find the best time to go to Zugspitze.
Removing the flash from a casting is beneficial in a head because it eliminates the swirling effect of the air/fuel. Don't go taking lots of metal out, just smooth out the surfaces and you should be fine.
A typical cloud-to-ground flash is a negative stepped leader that travels downward through the cloud, followed by an upward traveling return stroke. The net effect of this flash is to lower negative charge from the cloud to the ground.