25 mph is a lot of wind, especially for a trainer. The plane probably tops out at 50 mph or so, so flying in 25 mph wind will mean that the plane gets tossed around all over the plane. It will also mean that turns need lots of aileron and rudder compensation. Landings in the turbulence that is always near the ground will be dramatic as well. I flew an SPA match a couple weeks ago in 20-30 mph winds, and lots of pilots had trouble handling the turbulence from that in those fast and slippery pattern planes. I was one of only 3 real men out of 23 who didn't vote to stop flying 2 rounds early because the wind was making maneuvers hard to do.
So I'd say for a fairly new pilot flying a trainer, stick with 10 mph wind or less. If your flying site is usually more windy than that, ditch the trainer ASAP and get an Ugly Stick. That is the absolute best windy day plane ever made, and it takes off and lands just as easily as a trainer does.