We've all been there, whether you're an astronomer or not. We've been caught out by harsh weather conditions even during a walk back from the pub one evening when it turned a bit chilly.
So this example, it's only a minor discomfort, you'll be home in a few minutes, but any longer and things start to get really uncomfortable. Astronomy is no exception, and if you're unprepared for the conditions, what should have been a fun night can turn into a chore, possibly curtailing the night early.
Over the years I have learned a few tricks and surprisingly the old adage of "lots of layers" won't keep the cold at bay. Layering is one of the easy traps to fall into when dressing for a nights observing, loads of thin layers and you will be toasty warm all night. WRONG, at least in my experience.
This "layering" approach relies on a certain amount of physical exertion for the body to generate enough heat, which is then trapped amongst the layers you are wearing. Now I don't know how you folks ‘do' astronomy, but it has to be one of the least active pastimes I have ever come across and certainly doesn't offer many opportunities to generate internal heat.