On December 1, the Orthodox Church honors the memory of the holy martyrs Romanus of Caesarea and Plato of Ancyra.
In the folk calendar, December 1st is Plato and Roman the Winter-Pointers.
According to folk signs on Plato and Roman Winter Signs, you can make a weather forecast for the winter.
Weather signs for December 1
If there is no frost on this day, the winter will be warm.
Strong winds on Platon and Roman Winter Indicators promise a winter with snowstorms.
If crows are walking around the yard, a thaw is expected.
A circle around the moon is a harbinger of snowfall.
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.