The thermometer only reached 15.1C on Monday due to a brisk northerly breeze. This high was still 0.5C above the average.
The temperatures dropped rapidly overnight due to the colder air stream from the north and totally clear skies. The minimum of -0.3C was logged at 06.04 on Tuesday producing a ground first and the first air frost of the season.
The sun shone brightly after dawn with the barometric pressure having recovered that should produce a fine, dry day.