I was working at one inner-city business which bounced its connection off a microwave repeater about one kilometre way horizontally, and three hundred metres vertically.
About a year later, it started dropping packets all over the place (even when it didn't cut out completely, effective bandwidth could get as low as 2kbps - we might as well have been back in the early 1980s).
It wasn't the weather; it was a construction site that lay along the sightline. Every now and then the tower crane would swing through and park itself in the way. It seems microwaves didn't go through steel.