Question

what does a desert cooler cool better on a hot dry day

Answer 1

a desert cooler has pores on it which increases the rate of evaporation of water. and we know that evaporation causes cooling

Answer 2

Hey mate here is your answer:

On a hot dry day, the amount of water vapour present in air is less. Thus, water present inside the desert cooler evaporates more, thereby cooling the surroundings more. That is why a desert cooler cools better on a hot dry.

I hope this would help you mate

Thanks for asking and keep asking more ✌✌