Why can the north skate on the lake and the south can't skate on the lake?

Because it is colder in the north. The winter weather temperature in the north is about MINUS 20 degrees to 30 degrees. Because it is colder in the north, the ice on the lake will be stronger, so the north can skate on the lake, but the south can't. The winter weather temperature in the south is about-1 degree to1degree, and the ice on the lake is brittle and fragile.