Please restate your post more clearly.
Sra
Why does the rainy season in the tropical dry forest and tropical savanna biomes come during the warmer months?
3 answers
Explain atmospheric circulation and seasonal changes in the sun's orientation to earth to explain the highly seasonal rainfall in the tropical dry forest and tropical savanna biomes.
This site may help you.
http://climatology.suite101.com/article.cfm/causes-of-monsoon-rains-in-tropical-regions-around-the-world
http://climatology.suite101.com/article.cfm/causes-of-monsoon-rains-in-tropical-regions-around-the-world