The weather during the spring, summer and fall is awesome. It got to the low 80's a handful of times, maybe, this last summer;usually in the 70's, though. The winters can be brutal. I've been here for 4 yrs now and each winter has been worse than the last.
The hunting, though I haven't partaken myself, seems to be quite fruitful. Many times coworkers come in with deer jerky and the like. The fishing is good, too.
Cedar Rapids, and most of Iowa I'd imagine, are ideal places to raise a family. That is, as long as you don't crave lots of "adult" things to do other than going to a bar and drinking.