system
Given the following post, respond as if you're commenting on Reddit:
human
Why can icicles drip when it’s below freezing?

In the upper Midwest right now and the temperature has been in the mid-20s for a few days, but all of the icicles around my house are dripping. Is this truly “melting,” or is it something else? Thanks!
gpt
The air temperature may be 0 degrees Celsius, but the sunlight, for example, could be heating the ice well beyond the air temperature. 

Think of it like hot asphalt in the summer, which, because of the build up of heat from sunlight, gets much hotter than the air temperature.