I read that tomato pollen dies at 95 degrees F. My backyard only gets a few hours of light a day, but it traps the heat like you wouldn't believe. I'm wondering, if my pollen dies during the day, is there sufficient time during the cool evening, night and morning to generate enough pollen to set fruit?
I can't say that I noticed significant blossom drop last year, so maybe I'm worried about nothing.

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There's no specific temerature at which pollen is denatured ( destroyed) b'c different varieties seem to act differently with regard to that. Sustained temps of 85F and over can destroy the pollen, and no, it isn't regenerated the same day.

The blossom cycle is about three weeks but at any one time you have buds and blossoms in all stages.

Another way that pollen can become less effective is if high humidity occurs b'c then the pollen clumps and doesn't work as well.

Carolyn