כְּצִנַּת־שֶׁ֨לֶג ׀ בְּי֬וֹם קָצִ֗יר צִ֣יר נֶ֭אֱמָן לְשֹׁלְחָ֑יו וְנֶ֖פֶשׁ אֲדֹנָ֣יו יָשִֽׁיב׃ (פ)
忠信的使者對差遣他的人，就像收割時節雪的清涼，因為他能使主人的心神舒暢。
Rashi
Like the cold of snow Like the cold of the days of snow (winter), for which a person longs at harvest, but not actual snow, because snow is not beneficial during harvest.