As usual in clear weather, large local variations in air temperatures
last night in the "Solent" area.

Southampton Airport (12 miles inland) METARS reported minus 4C this
morning, Solent MRSC (coastal) minimum was plus 1.4C and it still
hasn't had an air frost this Autumn. My own minimum (5 miles inland)
was -1C, my first air frost this Autumn. I am in between the other
two.

Not all stations in the Solent area are equal... I am sure some other
areas have much larger variations between stations in close proximity
to each other, which can make it rather difficult to decide when any
given area has its first air frost...

--
Dave
Fareham (West)