I have had quite the opposite response from my oats. This year I planted them middle of august and we did not get a drop of rain for 2 weeks with hot temps and they all came up great and were about 6 inches tall after 3 weeks. Same thing last year, I planted them and we got no rain for a week and they all came up awesome. I usually don't even look at the weather when I plant because they've always come up so good.