As I understand it, it wasn’t normal practice to overnight them outdoors when it was cold.
We are looking at winter thru our winters....Bethlehem is in Israel...I know there are times it has not snowed for years in the winter...thinking I saw it was 4 years between at one time...and the temperatures can flexuate greatly.
I have no problem there were Shepherds tending at night in the nov/dec months.....but I do think the message is lost that God sent His angel to the ‘lowly Shepherds’ to announce Jesus’ Birth..in that day they were considered ‘unclean’ and vastly limited in social acceptability, if at all. But so much like God to choose the ‘unexpected’ when He works a great work among us.