RE: Jets and cold weather condition
The cold isn't the issue. It's the dampness, and possible mouse issues.
I had a bunch of older models out in the shed, and when I went to look for a few things in the summer... I found nests in some of them. (and soaked with mouse waste) The only good thing was that they were older wood models that were retired anyway. But... I basically had to strip out the good stuff, and burn the models.
Ad as above... moisture is going to be the death to turbine bearings.