My (8 year old) daughter's school is 3.5 miles away. I'm pretty sure she could make it both ways (given enough time: She is SOOO slow!) But she would have to cross 2 very busy suburban arteries and take one of those over I-5 on a very bike unfriendly overpass. Even if I could talk her into to it, there's no chance I could convince her mother!
Too bad, because they canceled the school bus this year. My wife loads her bike into the car, takes my daughter to school, parks about two miles from the school (and home), then rides to work. When I get off work I ride my bike to the car, load it in the car, pick up my daughter and go home. We all hate this routine, but it was the best we could come up with.
We've got the opposite weather problem. It's supposed to be 103 F (that's 40C) tomorrow. YUCK! Even at 6:00 in the morning I work up a sweat. And the ozone levels are off the charts to boot. I'm looking forward to winter.