Behold, thermal physics in its natural habitat! That pattern of melting snow isn't random—it's what happens when someone skipped thermodynamics class to play Minecraft.
The corners melt faster because they have more surface area exposed to warm air, creating greater heat transfer. It's like how your coffee cools faster in a square mug than a round one (which is why no self-respecting physicist drinks from anything but a sphere).
And no, the 90-degree explanation isn't about temperature—it's about geometry. Though I've had students who'd probably argue that snow melts faster at right angles because "angles are hot." These are the same people who become weathermen.