Joined: Jan 2009
Posts: 6,632
Likes: 2,356
From: Colorado Springs, CO
Bikes: 2015 Charge Plug, 2007 Dahon Boardwalk, 1997 Specialized Rockhopper, 1984 Nishiki International, 2006 Felt F65, 1989 Dahon Getaway V
As has been discussed before, In cold weather tires tend to hold inflation longer. In hot weather they seem to loose pressure faster. At least that's been my experience.
I bike commute most days, but my fenderless 700x28 12-speed may sit for a month untouched in the winter. I usually run the tires at 90psi, and aftersitting for a month they may be as low as 65psi., but sometimes only down to 80 after a month.