Answer: hotone

AnswerCrossword Clue
HOTONE

It's hilarious!

HOTONE

Knee-slapper

HOTONE

Great joke

HOTONE
Definitely a day for air-conditioning
HOTONE
Day during the dog days
HOTONEDefinitely a day to run the A.C.
HOTONEThigh-slapper
HOTONEScorcher