Question

give reason for clothes dry slowly during rainy season

Answer 1

During rainy season sun temperature is low. Therefore heat does not get clothes and dry slowly.

Answer 2

Evaporation is a phase change where liquid will convert into gaseous state below its boiling point.
Rate of Evaporation Depends on:
1. Temperature
2. Humidity
3. Surface area
4. Wind speed.

During rainy season, the amount of water vapour[humidity] is more in the atmosphere and As the rate of evaporation will be slow  because of high humidity hence The clothes dry very slowly during rainy season.