It's the warm time of year, folks. Hot air is thin air. The difference in air density between a 50 degree winter session and 90 degree summer session is approximately 10%. Roughly, it makes a 7.5 feel like a 6.7.
(This ignores the more humid air which just makes things worse.)
Rig big and have a good time!
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What happens in a black hole stays in a black hole.