Unless you put a dehumidifier in the garage with you car it is likely to 'sweat' anyway, and encourage more corrosion than leaving it outside.
Sorry, forgot to mention that it's pretty well ventilated...
In the evening wet after rain in, next morning.... dry!
If garage is well ventilated what is to stop it getting as cold as the outside air ?
Garage is between 2 houses so the temp in there never gets as cold as outside even though the garage door and rear is ventilated. Plus I do have a descicant dehumidifier running that does suck out damp air.
Our spacious garage (6 by 4 meters) is located under an apartment block. The access to the garages has an (automatic) door and each garage has its own door. So quite shielded from the winter outside.
Only once in 15 years the water in the garage had to be shut off because the temperature in the garage approached 0°C. This was during extreme winter weather in January 2013 with night temperatures outside of -20°C and lower. During the day max. -6 or -7°C for a longer period. Normally, the temperature in the garage in winter remains around +7 to +10°C.
In addition, the building has a ventilation system, separate for the garages, effective and with gas detection.
The garage is almost ideal. Only one complaint: if you drive the car in dirty, it won't come out clean...