As all ready pointed out, a fairing is not the best for a warm day, but let me add it can make you feel like a bug under a magnifying glass even if it is on the cool side with direct sun. I used one on my Stratus, have one I swap back and forth between the trikes and the Corsa. I almost never use it anymore, mainly if I need to ride in strong winds. Doesn't make you any faster in the winds, doesn't seem to help going down wind as one would hope, but by keeping the pounding wind off your chest, it really helps moral.
Alsoi can be good for scaring dogs who don't know what to make of you/it.