We do not have a wind gauge. However our wind sock is calibrated at 30 knots. I have flown when it was straight out and then some. Not a trainer though. I would ground most trainers at 20-25mph. A high wing also is a problem to taxi in high wind. It will flip over in the cross wind.
The other thing is the bumps in the wind.(for lack of a better term) There are days here with a steady 20mph that are fine. There are other days that the wind goes from 15-25 in an instant that are terrible.

David