On November 21, the Orthodox Church celebrates the Council of Archangel Michael.
In the folk calendar, November 21 is Michaelmas Day, Archangel Michael, Michael the Archangel Day, Michael the Gryaznik, Michael's mud, Michael's thaw.
According to folk signs, on Michaelmas Day you can determine whether the winter will be snowy.
Signs for November 21
If the morning is frosty, December and January will be snowy.
Morning fog on Michaelmas Day promises a warm winter.
If it snowed on this day, there will be snow on Easter.
Wet snow on Michael's Day is a harbinger of a rainy spring.
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.
