Tell him your friend in the Green Bay area has chicks hatching this weekend and her friend in the UP hatches them year round and doesn't even brood them indoors!
Mine are getting ready to hatch now and I have no coop, and we have several inches of snow on the ground. I figured the sooner I started them, the sooner I would be reaping the rewards of my efforts - delicious fresh eggs! Even if you got your chicks today, it would be at least a couple of weeks before you would need a coop for them. C'mon dad!
*Note to Dad: As a fellow wisconsinite and a parent, I feel your pain! I figure my chicks hatching this weekend can brood in the basement for a couple of weeks and then I can move them into the garage (obviously with a heat source) and I'll just have to park outside for a few weeks. This gives me several weeks in which to come up with a coop which I will have to build with no help from my husband, he's not really interested in this chicken thing. That's okay, I'm pretty handy, for a girl! I know how it is when kids get impatient but I think you'd be safe getting chicks now and just think, the sooner you get them, the sooner they'll start laying eggs for you! Plus, you can have your kiddo help you build the coop and learn some handy lifeskills. Win all around! Go Badgers!