It's best to prune roses in the early spring just before they break dormancy. Pruning now will encourage new growth which will not harden off in time. Don't prune more then 1/3.

I agree if you are in a windy site then a trim of about 1/3 to reduce the chance of wind rock is about as much as I'd go at this time of year. You can of course prune it a bit more say 1/2 when all the leaves have fallen.