Why are there never "mega-fights" in the summer?

Cinco de Mayo - Obviously in May Mexican Independance - September

Because Vegas is hot as death in the summer and most of the mega fights go on there.

just tradition,

good question..............

this is really true... i always want to go to a fight for my birthday but theres neevr any fights..

Margarito Cotto was in the summer.

most people are in vacations just like me. I never couldnt watched a good boxin match in July or august cuz I was doin some other things far away from home :D

july-august, its always in the fall or spring suppose its tradition to have the mega fights in march/april/may and november/december