I hear parents all the time -
Riverside is too hot - Outside temps are upper 90's
get it!! Lets say 90-102 degrees--yes its hot but
definitely still playable.
Too Cold--Vegas Cup is perfect example, its the high desert and temps get chilly night games in the low 40's,
still playable.
Wind Suck regardless of situation , unless your downwind, then Id say shoot at will !!!
In my personal opinion playing sports in sub par weather is fun, and my kids love it. They always talk about playing in the snow?? Can you prepare for it , sure why not......but why......? Do you think you build up a immunity or you can learn to squint your eyes better because you practice in the rain for a week??? Why risk getting sick, go rent a indoor facility with my money and keep my kids healthy for the game on the weekend.
But tryouts in rain is just dumb. And like people are saying , you cannot get someones best performance in those condition anyway.