The preferred route is Clyde to Middlemarch due to the Northwester if strike it,heard of a few from Tauranga a few years ago pushing their Bikes from Middlemarch to Hyde as they could not stay on the bikes due to the wind

Central Otago even in summer can be affected by sea breezes also which roar in either direction up and down the valleys so it can be 50/50 of either helping or hindering but it's a great experience whatever the weather