On December 3, the Orthodox Church honors the memory of Saint Proclus, Archbishop of Constantinople.
In the folk calendar, December 3 is Proclus' day.
According to folk signs, on Proclus Day you can determine whether the summer will be rainy.
If it rains on this day, the summer will be rainy.
If it snows on December 3, it will rain on July 3.
If snow falls in the morning, a thaw can be expected by midday.
If magpies hide under the roof, you should expect a snowstorm.
Cirrus clouds are also harbingers of a blizzard.
For reference
A sign is a stable connection between two phenomena of objective reality, one of which is understood as a sign, and the second as its interpretation, usually in the form of a forecast for the future; a linguistic (in the form of an aphorism, paremia) representation of this connection.