All of this assumes the rain is falling perfectly vertically. Some trigonometry will show that in the case of a tailwind, where the rain is at your back, a scen

All of this assumes the rain is falling perfectly vertically. Some trigonometry will show that in the case of a tailwind, where the rain is at your back, a scenario is possible where there is a finite speed beyond which going faster will cause you to intersect more raindrops, rather than fewer. Calculating the precise numbers is left as an exercise for the reader.