You may be able to get black gloves for a dollar with snow on them already (from dollar stores).
If using real snow, this is best done during wintertime, to make it more believable (the snow would melt in summer). When you’re at your secret place, start to play around in the snow with your bare hands (if you can bear it) and throw it in the air. Do this for a few times then look at your hands. Smile and get ready to do your trick.
If you can’t get the fans, don’t worry, just stuff some of the fake snow in your sleeves and twirl around with your sleeves down, causing the snow to slip out of your sleeves, but this is not recommended because you’ll look like you’ll be dripping wet afterward, slip snow out of your sleeves in moderation! Practice this a few times before the real deal, in a private place.
If you’re pretending to hide your snow powers, do the following: After you run out of snow, toss the snow on the ground in the air, then seem to notice the person. Start to look worried, run up to the person and beg, “Please don’t tell anyone. . . " and you’re done.