While controlling the presentation and ultimately the speed of the fly will be the key to winter success, selecting the right day and properly dressing for the elements will be the key to fully enjoying the experience. I search out days when the both air temperatures and winds moderate. Air temperatures that creep up into the 30s can actually feel quite balmy and even high teens or 20s can be tolerated with low winds.
Layering with clothes designed to pass moisture to an outer layer is the only effective way to dress for wintertime conditions. Wicking underwear and a breathable, waterproof outer shell is essential. One of the best ways to stay comfortable in water temperatures that hover in the low 30s is to wear a pair of boot foot waders. While stocking foot boots are best for hiking and overall ankle support, nothing beats the warmth value of being able to move your toes around in the warmth and comfort of an insulated boot. A hat and gloves will keep the extremities warm. For extreme cold I prefer fingerless gloves with a mitt that can flip over top.
One of the challenges to winter fishing in the Great Lakes region may be to find open, flowing water. In winters with moderate weather patterns, open water can readily be found, particularly in the lower lakes. Extreme winter weather may restrict the opportunities to the largest rivers and those with either a higher gradient or that are fed from an impoundment. Some rivers, particularly in Ontario, will have a closed season during winter months to protect wild fish production. Paying close attention to the conditions and being flexible is all part of the equation.
Great Lakes winters can be long and harsh. But regularly getting outside and blending into the elements can take the sting out of the situation and be a certain cure for cabin fever.