Kosteussää

Kosteussää is a Finnish term that translates to "moisture weather" or "damp weather." It describes atmospheric conditions characterized by high humidity and often precipitation, leading to a general feeling of dampness. This can include fog, mist, drizzle, light rain, or even periods of heavier rain where the air feels saturated.

The term is commonly used in everyday Finnish conversation to describe days when the air feels heavy and wet. It's not a precise meteorological classification but rather a descriptive term for a range of weather phenomena where moisture is a dominant factor. Kosteussää can occur in various seasons, but it is particularly prevalent during autumn and spring in Finland.

High humidity associated with kosteussää can affect comfort levels, making the air feel cooler than the actual temperature during warmer months and contributing to a chilling effect in colder periods. It can also have implications for outdoor activities, driving conditions due to reduced visibility, and for materials susceptible to moisture damage, such as wood and certain textiles. While not a severe weather event, prolonged periods of kosteussää can contribute to mold growth and impact infrastructure if not properly managed. The term encapsulates a common and noticeable weather pattern in the Finnish climate.