From the Farmer’s Almanac…
The Ember Days are the Wednesdays, Fridays, and Saturdays that follow in succession after (1) the First Sunday in Lent; (2) Whitsunday–Pentecost; (3) the Feast of the Holy Cross; and (4) the Feast of St. Lucia. The word ember is perhaps a corruption of the Latin quatuor tempora, “four times.” Folklore has it that the weather on each of the three days foretells the weather for three successive months; that is, for December’s Ember Days, Wednesday forecasts weather for January, Friday for February, and Saturday for March.