It varies a lot, but we have potentially as wide a temperature range as
anywhere in the US. I've seen it to 108° in the summer for a couple weeks
at a time and sometimes over 100° at night. Most winters it doesn't get
much below zero and when it does it might get to maybe -6° for a couple
or three nights but sometimes it will stay near zero for weeks.

Thus far we have been warned of a hard winter but right now we are supposed
to have an overnight low of 25° and there was frost on the car when I came
out of a jam session at 10 pm. Tomorrow it is supposed to get up to about
50°. That is why the blind is better than cardboard - you don't have to
get out of the car or under the hood to adjust it.

Having part of the radiator covered up when it is cold kind of evens things
out so that when the thermostat opens you don't pump in a bunch of VERY COLD
water into a warm engine, etc.
--
George Downs, The "original" Walrus3, Bartlesville, Oklahoma