It was 51°F at game time, not cold enough to make a difference unless they were inflated at 130°F!...............
Wanna do the math again?
P1T1=P2T2, where T is in Kelvins.
:)
As for actual effect? Essentially none. Anything over about 9 pounds is hard, and pretty indistinguishable. Apparently part of the first half they were using the Colts balls, and the entire second half the Pats balls had been quietly readjusted, with no sign Brady noticed.
The Colts player credited for noticing the difference claims he didn’t.