Very cold temperatures affected western and central Wyoming from Sunday night into Monday morning. Check out this list of locations that hit -10 degrees or colder. A cooperative observer site 16 miles southeast of Ten Sleep dropped to -30. The Little Wind River hydrology site south of Riverton got to -29 degrees. The coldest reading across the state was at the remote automated weather station in southeast Crook County - it reported -36 degrees between midnight and 2AM this morning.