As a golfer in N.Ireland i reckon i know a thing or two about playing in cold, wet, windy miserable weather. Apart from realising that the ball isn't going to fly as far in cold air (you can probably take off 5 yards from your summer distances), there are 2 main things for distance control in the cold. 1- Keep your hands warm with a pocket handwarmer or some warm golves between shots. When your hands are cold you can't control your grip properly resulting in varying shot distance. 2- keep your ball warm! this may sound silly but if you keep your ball in your pocket as much as possible i.e. between holes, it will give you a few extra yards and feels softer off the club.
The most basic advice for bad weather is to be properly dressed and kitted out. Make sure you wet gear fits properly, it's not easy swinging a club in a jacket thats too small or too big. Keep the hood on your bag to shield your clubs from the wind and rain. And just stay warm and dry.