Lake County has average temperatures ranging from the low 30's in the winter to the high 90's to low 100's in the summer. An average humidity of 50% in the winter and 30% in the summer which means virtually none of that famous California fog.
They are lever locks, with between 6 and 12 levers. They are double bitted and asymmetric, so the lock essentially has two different sets of levers. In addition, they are mostly quadruple throw, so you need to pass 4 sets of levers. The bolt work has 2 or 4 hardened steel circular bolts, providing good saw resistance.
The double bit key has an enlargement at the base, so the lock must have a much wider slot for insertion of the key compared with that for a cylinder lock. This makes it much easier to introduce burglary tools or to manipulate inside the lock. The slot for inserting a double bit key is very wide.