Presently it is simply too hot for open top Morgan-driving. That may be the reason you don't see any Mogs on the streets. I once learned it the hard way in my 4/4 on a trip to Spain with temperatures above 30°. No AC means no fun at high temperatures.
Hannes once: Green M3W; 2013 now: Red 4/4 Sport; 2011 and some practical cars for use in real life