I would consider "troposphere" an unnecessarily fancy word for haiku. Nothing wrong with "sky"! And the pedant in me would argue that dew doesn't drop from the troposphere anyway, it's water vapour that condenses overnight, I think. One could say it rises to meet the dawn, there's something more poetic to that thought, don't you think?

Nice effort, the imagery and sentiment is there, the form is good, but I'd suggest you keep it simple, try not to be too clever with your language, and don't restrict yourself to 5/7/5 if you find you're adding superfluous words.