Answer: serein

AnswerCrossword Clue
SEREINClear day rain
SEREINMisty sunset rain.
SEREINMeteorologist's fine twilight rain.
SEREINFine mist
SEREINMist from a clear sky
SEREINFine rain from an apparently clear sky
sereinfine rain falling after sunset from a sky in which no clouds are visible
sereinfine rain falling after sunset from a sky in which no clouds are visible.
sereina fine rain falling from a clear sky