Mine used to be driven all year round, not so much anymore, but still gets a fair number of miles racked up.
I have no issues driving in the rain, a good soaking makes the wood swell a little and the doors fit better
Like others, I prefer to start the drive in the dry, but if it gets wet, so be it. The top has very rarely been up
except when the wife not so tactfully suggested it went up!
Cheers,
Dave.