[burroak]

Just like air pressure in tires on s car, doesn’t the air temp have a + or - effect on pressure ? Sure it does.

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That is why the rules state 12.5-13.5 psi to compensate for that.

2 lbs. below the lower limit is not a mistake.

[Moonman62]

That is why the rules state 12.5-13.5 psi to compensate for that.

2 lbs. below the lower limit is not a mistake.

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Yep. And they say some QB’s like the lower end of the legal range and some the upper. A ball at 10 lbs is a big difference.