Because the weather's too unpredictable. Organized races have a lot going on behind the scenes and it's simply impossible to pull it all together without setting a specific day to do it on. So organizers do that and hope for an optimal day.
If you mean why isn't racing done in the winter season, that would be due to the possibility of glare ice and snow and other such nastiness on the track. Slicks on anything but clean, dry asphalt will result in a sliding, spinng, flipping, crashing car.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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