Our reservoir fishes better through winter than it does through July and August - as long as it's not frozen over, as it has been for the past two winters.
I like to fish a Damsel, or an unweighted Woolly B***** deep and slow on an intermediate (I don't think you can fish them slow enough on faster sinking lines).
Most of our members though prefer to
float-fish an "egg" with another "egg" or bloodworm on a dropper just a couple of feet from the point.
You'll have to find what depth they're taking at of course. Start off around 10ft. The water's colder near the surface so go shallower on the milder days and deeper on the colder days.
These are only my observations - I don't see it as
fly-fishing.