mine are the same for the same reasons here in Korea. It's either raining or ungodly hot in July/August, but October/November are great. Nice and cool with clean air. Spring months would be nice if not for the seasonal dust.It depends which country I'm in. In Japan I like November the best, because the weather is perfect for hiking and riding, but it's still warm enough to be outside most of the day. July is the worst, because it rains solidly for the whole month.
When I lived in the UK I liked July and didn't like November.
If I'm back in Minnesota though, I'd say September and May.