härmä
Härmä is a Finnish word that refers to frost, specifically the feathery ice crystals that form on surfaces when moist air comes into contact with a surface that is below freezing point. It is a type of deposition, where water vapor in the air turns directly into ice without first becoming liquid. This process occurs most commonly on cold, clear nights when there is little wind.
The appearance of härmä can vary greatly depending on atmospheric conditions. It can manifest as fine, powdery
In Finland, härmä is a common sight during the winter months and is often associated with the