I always have two bics - and I always check 'em both before I
go. I'll also have a backup like book matches or a firesteel
in the winter.

at 35F however, you're at the temperature that butane stays liquid - so unless you warm it up in your hand or a bit, it ain't gonna work if it is at ambient temperature.

Every spring I buy another 4 mini-bics like religion at the
start of hiking season