I looked at our dew points and they are well below the expected temperature.
Without this you cant have frost unless the ground temperature is that much colder.
In other words if your thermometer says 35 at 5 feet up but the temps at the plants are 32 and the dew point is 34 you can get frost.
Water simply will not freeze above 32 degrees
Behind this cold front is a mass of dry air dropping the humidity way down thusly bringing the dew point down into the upper 20's.
There are other ways frost can form but it isn't going to happen here unless we have an ice age.
When I was growing up we had a thermometer a barometer and a hygrometer.
With these we would determine is there was going to be a frost or not and if we were going to go fishing.
If the barometer (barometric pressure) is falling the fish stop biting most of the time.
These are handy tools for any gardener to have.
Barometric pressure falling can also cause your joints to hurt.
It isn't proven but they are doing research.
Yesterday before the front hit and the pressure was falling my right knee started to hurt a little.
Worth