If you were in a Cessna 150/152 Aerobat you'd fly the approach inverted. That's the same as being upside down. You'd then execute a snap roll at fifty foot above the ground flicking any residual rain drops from the windscreen and land. This is a little advanced technique and would usually only be demonstrated by the instructor just before you went solo for the first time, in case you got caught out by a squall line while doing your first flight on your own.