Several pairs for sure. I've never got on with gloves with individual fingers so I use those that have the pull over mitt for the fingers. Struggled to find them at one point but they can be found, sometimes in the fishing section of some outlets. Handy, as you can slip the mitt part off without removing the whole thing, if you need your fingers for anything.
I try and buy clothes, especially my waterproof shell with long enough arms to cover the hands, as I've found it impossible to keep gloves dry in very wet conditions, hence always carry spare.
For very cold weather or severe windchill I've a pair of Extremities mitts, which have a goretex outer and a fleece inner. They have a strap across the hand and a toggle to tighten around the arm, both of which can be done with them on. They are excellent at keeping hands warm in the worst weather, the key being the outer windproof, not cheap but worth it