When your sitting still the rain seems quite mild, probably cause the windshield is not slanted and the rain falls on an almost vertical surface...not a whole lot of turbulence.
I think we can all agree there's a lack of aerodynamic flow over the front windshield...it's quite turbulent. Right around 75 mph you can really hear the air start to hammer that glass. The rain is probably just caught in this violent/turbulent air and you hear it smashing against the windshield. No biggy.
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