yes... wind is a terrible thing for beginners. i would nothing more than 10mph and steady. this for three reasons

these two have been said
1. Controlled flight is more difficult - you will lose control at some times and beginners may panick

2. Crosswinds are hard to curb in landing - not easy to landing safely in crosswinds unless you have a big big landing area. i've had planes come at me in the pits because beginners misjudged the crosswind and with a lack of wind nearly flew into a crowd.

this one is from me
3. Tuning is critical in wind - two examples:
A. a deadstick (dead engine) on a still day is demanding, a deadstick in wind is a killer.
B. power is important in the wind. this is my favorite... i sold my first WM Cub 26 with an OS FS-30S. it wasn't the most powerful of engines but it was always fine with the cub and i've flown in windy conditions (flew in hong kong where the mountain was behind us and the harbor in front) and never had any problems. when i sold it to a beginner (well he was a daring flyer but his fundamentals were terrible) we exchanged in the air, meaning i took off, he flew it in the air and i landed. a week later, i came back to the field and he said he had just lost it. he claimed that he had tuned the engine perfectly but it was just not powerful enough to combat the wind and no matter how hard he tried, the plane was just blown away. right. in reality, he must have tuned the engine poorly and running on a poorly tuned fourstoke on a windy day is just asking for trouble. anyway, beginners should know that with a change in temperature, a change in environment, a change in fuel and particularly a change in prop could all alter the tuning of an engine. i was extremly sad to see that plane end up like that...

good luck!