The "Merla" days

Taken from internet... "The so-called days of the" merla" (hen blackbird) are, according to tradition the last three days of January (29th, 30th and 31st) that are supposed to be the three coldest days of the year. In case these days are not very cold, it might mean that Spring will come later. This tradition is similar to others based on moon phases and the exit of the bear from its den as methods to predict the weather a few days after the days of Merla, or Candlemas. "