Yeah, I think so too. That's enough temperature difference, I think, between indoors and outdoors to cause pressure drop. That reminds me. I pumped my 120psi road bike tires once while outside, the temperature was in low 40s. Then, later in the car, going back home, after turning the heat one one tire exploded. I almost drove off the highway and my ears were ringing for like an hour! Stupid enough, I didn't think to lower the pressure in the other one, it exploded later at home

Adam