NEWTON:Rainy and Dry Seasons; Evaporation
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Name: Meenakshi
Status: other
Grade: 9-12
Country: Trinidad and Tobago
Date: Fall 2013

Can you please explain the reason why there is a large amount of rainfall during particular months of the year when throughout the year,water is constantly being evaporated and forming clouds. This happens in countries that only have two seasons: dry season and wet season.

Hi Meenakshi,

Thanks for the question. Yes, water is constantly being evaporated by sunlight and wind. Rainfall occurs since the clouds can no longer support their water content given the ambient conditions. During the wet season, the atmospheric conditions change so that water droplets in clouds are no longer stable and begin to fall.

I hope this helps. Please let me know if you have more questions. Thanks Jeff Grell


The Earth tilts on its axis from 23 degrees North to 23 degrees South and back again every year causing the different seasons. When the Earth's Southern Hemisphere is pointed to the Sun Sep 21 to Dec 21 back to Sep 21, it experiences Summer (Longer days than nights) and the Northern Hemisphere experiences Winter (Shorter days than nights).

This uneven heating of the Earth's surface during the seasons explains the season rains and dry spells.

Sincere regards, Mike Stewart

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