Another early frost

It could have been so much colder overnight if it hadn’t been for some low cloud and the wind never really falling out across the north. The 18-06 period is often not the coldest period in autumn and winter, as was the case at Altnaharra this morning when the 07 UTC temperature was -4.0°C and still falling. A distinct warming from -3°C to +3°C on Cairngorm from 03 UTC, maybe it’s milder air above an inversion associated with a layer of SC that’s spreading in from the north, or has someone set a fire under the sensor?

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