I had a RMR screen fog up in a high humidity situation and since it was dusk, it made the dot scatter, becoming unusuable.
I found wiping the screen only slightly improved the visibility. After that incident, my nine month try out ended on top of a Glock 19. The RMR had too many compromises for me such as wiping down a RMR screen on a loaded Glock in a crisis situation .
That said, no actual thermal shift was discerned, just a totally obscured view.
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