JHlewis, just a few more thoughts.

One of the things I used to go to were small hippy style gatherings.
(a gathering of people, and a gathering of wild herbs, no money allowed but plenty of trading going on, usually more than 5 miles from a road.)
These gatherings were often in the spring and fall, depending on what was being gathered.

So not bitterly cold, but still cold enough at night that a person could die of exposure if they were not ready for it.
Usually heavy dew.
Chilly enough for frost some times. Quite often often wet and rainy.
A person would not be able to sleep well for sure unless they were well prepared for camping out.

We would usually have quite a few youngsters from the cities show up with no proper gear for sleeping out. No tents, no tarps, maybe a crappy blanket.

So we used to put up a tarp for rain protection throw some mats and blankets down to cover the ground and get them to do what we called a "love pile."

After the first chilly night they got the idea.
A mass of 10 or 15 bodies gave them enough warmth to make it through the night OK even if there was heavy frost.
The more kids in the pile all the better.
(Dogs give off a lot of heat too, but you end up smelling like them.)

If it was windy at all we would hang some tarps as wind protection for them.

At one Gathering we put up a large tarp tepee for the kids with a small fire altar in it to warm them, but it was not as good.

Not only could we not fit enough of them into it for a pile up, the ones we could fit in stayed up all night stoking the fire, bongo drumming and chanting.
Then they all wanted to sleep all day when it warmed up instead of learning about herbs by helping to gather them.

Both the ones who had been in the tepee because they had partied all night and the ones outside because they had stayed awake shivering around camp fires all night.