Because summer is the rainy season, there is no time to go anywhere convenient towel it dry. Unlike the rainy season will go, it's hard ... it smells musty.
Because summer is the season without rain. The time will come and go, it's easy to dry clothes, it's not like the rainy season, it's hard to go wrong. Drying is stale
Because summer is the season that there is no rain, time to go wrong, conveniently, the laundry is dried. Not like rainy season จะไปไหนมาไหน difficult. The laundry is stale.