Wait a minute, why would you be able to only store the bike inside for winter?
Logically I would say if you can store it for winter, you can store it for non-winter
I know from all the dorms I have been to, no one cared if a bike went inside, in fact that was the preferred option when someone had a nice bike. Against the rules? Maybe but I am sure the RA or whomever has something better to do than look for bikes in dorms...
Most dorms also have privacy policies to protect students, so the 'authority' can't just come in whenever they want, but the trick is that you have to keep the door closed and secure. IF it is left open, they can come in.