The onset of cold weather in northern Kentucky got me to check the air pressure in the vehicles. I found that pressure in about all the tires was about 5 pounds per square inch lower than it should be. The tires were inflated to match the pressures shown on the label inside the driver's door.
Doing a little research I found this website about vehicle tires:
The item that relates to what I saw is this, "Every time the outside temperature drops 10 degrees Fahrenheit, the air pressure inside your tires goes down about one or two pounds per square inch." So I need to reduce the pressure once the air temperature warms up again.