One of the mysteries of the English language finally explained.
Frost which does not have a white surface.
ice crystals, ice, rime, rime ice, verglasView synonyms
- ‘We had black frost in late winter last year with minimum of -5 degree C.’
- ‘A black frost is when the dew point is less than the low temperature reached.’
- ‘For two weeks we had a black frost day and night with a strong east wind and then on February 2nd, when everywhere was bone dry at 3pm, the snow started to fall.’
- ‘The black frost we experienced in late May came down from the north, which was very unusual, and it frosted many indigenous trees in the Bushveld.’
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