Some days 15-20 MPH is too much but I have been out in some winds stronger than that and killed a few.
A few years ago I was hunting with 35 MPH wind and heard a squirrel bark. I was just about ready to turn around and head home. What the squirrel was barking at was a coyote hunting with its nose into the wind. Long story short, I didn't get the squirrel but nailed the coyote.