Many school uniforms have a limit to when you're allowed to wear shorts; for example the school I went to had it from the beginning of the year to October 15, then the boys had to wear pants and the girls could wear pants or skirts (aren't gender roles gr8). We could start wearing shorts again on April 15.
I remember one year it got really hot in the middle of March and everyone just ignored the rule for a while. Eventually the teachers tried to crack down on it, and the boys' argument was exactly this: the girls can wear skirts, let us wear shorts. If I remember correctly, they still had to wear pants, but they didn't suffer too long since it was already April by then, and I'm sure they lifted the rule if it was deemed too hot for pants.
I remember one year it got really hot in the middle of March and everyone just ignored the rule for a while. Eventually the teachers tried to crack down on it, and the boys' argument was exactly this: the girls can wear skirts, let us wear shorts. If I remember correctly, they still had to wear pants, but they didn't suffer too long since it was already April by then, and I'm sure they lifted the rule if it was deemed too hot for pants.