You sure it's Celsius? 'Cause that's a whole 50-59 degrees Fahrenheit! Freezing is at 32.
Anyways, wear LAYERS! You're gonna get HOT when skating! Bring a warm coat, a sweater, and a t-shirt or long-sleeve. That way, if you get warm, you can just take layers off instead of being super hot or super cold the whole time!
Also bring a scarf! I def recommend that one. Again, you can take it off it gets to warm!
WEAR THICK SOCKS!! SKATES CAN LEAVE REALLY BAD BLISTERS!!
Have so much fun skating, and I hope this helped!