The time of day when the relative humidity reaches a maximum value is usually:
A
At the time when the air temperature is highest.
B
In the middle of the afternoon.
C
At the time when the air temperature is lowest.
Correct option is C. At the time when the air temperature is lowest.
The percentage of humidity is highest at the time, when the air temperature is lowest. When the air temperature increases, the relative humidity decreases. This is because air can hold more water molecules with the temperature being high. So, warmer the air more will be water molecules held. in the middle of the afternoon, the temperature is highest therefore relative humidity will decrease.
So, the correct answer is option C.