Maybe. Why dont you estimate the rel. humidity there. Rel. humidity meters are very inaccurate but if it reads 50% in the garage you'll be fine.

If its 50 of in the garage and 0 oF outside you'll be fine. If 45 oF and 100% rel humidity outside prob. not.

If you're not careful with the airbalance you could develop rain clouds in the upper atmoshere of your garage.

"develop rain clouds".... actually happened in the Astrodome and then later on in the Stupordome.

BUMP for those looking for the factory winter storage checklist.

And... if it is realy humid and not too cold, then rust may be a 2o issue compared to mold over the interior.

For winter, the main thing is to raise the air temperature and get some circulation going.

You can always buy one of the Carcoons. Its like a big platic bubble that blow filtered air around in the bubble. your car is in the bubble. I do not have one or tried one but it sounds like a good idea.

I'v got my garage heated at a min 50°F and the dehumidifier set at 60%. I also have a rubber mat under the car for a moisture barrier.

The garage is usually opened once a day, ingress/egress by one of the family and therefore gets air circulation.

The leather is soft and supple and no rust anywhere.

Mike

Thoms experience with accellerated rust when the dryer output was vented into the garage should be noted, because the byproducts of combustion are CO2 and H2O.
I've got a detacted/unheated garage, but noticed that when I heated it up with the propane torpedo, water will quickly accumulate on anything cold- toolbox, car etc....
In a detached/unheated garage, it's probably best to heat it for a long day to evacuate any water and run a dehumidifyer while it's cooling down.