Question

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

Answer 1

A desert cooler cools better on a hot dry day because on a hot dry day temperature is high and humidity is less which helps in better evaporation. Due to the higher rate of evaporation it gives better cooling effect.

Answer 2

because on a dry dry hot day the humidity in air is relatively very low because of this the water in the cooler gets evaporates easily letting the surface and graas of cooler being more cool and thus the the cooler thows a relatively more cooler air . hope it helps dear