I had an MX5 in the early 90's. Driving back from Wales in February. Roof down, bags behind seats, with climbing slings karabinered into seatbelt anchors. Starts raining, it ok, the aero dynamics means the rain just passes overhead at 70mph. Join M6, heavens open, and traffic grinds to a halt. Takes forever to get to Corey services. Get bags off top of touneau cover. Roof up, bags behind seats again, we resume journey. Heating set to max and steam rising everywhere. Kids in cars we pass point at the two guys steaming away in the MX5.
Loved the car but eventually sold it when roof started leaking. Super reliable though and a joy to drive. I had the roof down most of the time, leather flying jacket and leather gloves for winter driving.
It wasn't even that bad in snow despite light weight and rear wheel drive. But the original that I had, had 185mm tyres rather than the superwide ones you see these days.