Kylmäjakson

Kylmäjakson is a Finnish term that translates to "cold period" or "cold spell." It generally refers to a sustained period of unusually low temperatures. The specific duration and temperature threshold defining a kylmäjakson can vary depending on meteorological context and region. In Finland, where the term is commonly used, it typically implies temperatures significantly below average for the time of year, often accompanied by frost or snow.

These cold periods are a natural occurrence in Finland's climate, especially during winter months. They can be caused by the influence of cold air masses originating from Arctic or Siberian regions. The intensity and duration of a kylmäjakson can impact various aspects of life, including agriculture, energy consumption, and transportation. For instance, prolonged cold can lead to increased demand for heating and can affect crop viability if it occurs during growing seasons.

The meteorological definition of a kylmäjakson might involve consecutive days where the average temperature or daily minimum temperature falls below a certain percentile for that specific season. Understanding these cold periods is important for weather forecasting, climate studies, and public preparedness for winter conditions.