If your friend says to you “There is no rain” and you go outside and it pouring, you could say 'Hardly “no rain!” ’ As a kind of mocking comment highlighting that it’s the complete opposite of no rain. It is very hard to call is “no rain” when it’s raining so much.

Hope this helps!

I also thought that was how it worked, but then again, as English isn’t my first language, I’d rather not dwell on that detail