human
Why does it rain on the day of a full moon?
assistant
Rain is caused by the condensation of water vapor in the atmosphere. The amount of water vapor in the air depends on the temperature and humidity. When the air cools down at night, the amount of water vapor increases, and when the air warms up during the day, the amount of water vapor decreases. This is why we get more rain on the days before and after a full moon because the nights are cooler and the days are warmer.