According to the OMs of the two Hondas, 10W-30 is okay down to 20F.
According to the OMs of the two Subarus, 10W-30 is okay down to -4F.
According to the BMW's OM, 10W-30 is okay down to -22F.
What kind of car do you have and how cold does it typically get where you live?
Is the car garaged overnight?
10W-30 was the standard oil for a number of years before 5W-30 came along.
A 5W-30 would likely be preferable, but a 10W-30 would probably be okay.