Good point....plus sometimes temps can drop, or rise, fast and drastically.
It's more the difference in temps over a day or so, than temps they are used to.
Will wait for pics, but sounds like they may need more shelter.
Oh, and.....
Where in this world are you located?
Climate is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, then it's always there!