Where I used to live, 15 mph winds was a mild day.

I made the mistake once of going out when the wind was closer to 30 with gusts to 50 or 60. I was doing 45 mph on flats and mild inclines with the wind at my back and was struggling to go 8 mph in the 39-27 heading in to the wind.

The only advice I can give you is to stay low and suck it up.

And since you are in Michigan, at least you won't have tumbleweeds to contend with.