Yöpakkaset
Yöpakkaset, or night frosts, refer to periods when nocturnal air temperatures drop below freezing, causing frost to form on exposed surfaces. In Finland the term is commonly used to describe frosts that occur in autumn and spring, although frost can appear at other times during clear, calm nights.
The phenomenon is primarily caused by radiative cooling. On clear skies and with light or no wind,
Frost can occur as surface frost on plants and objects or as air frost measured higher in
Impacts include potential damage to crops and ornamental plants, reduced growth of sensitive vegetation, and hazards
Yöpakkaset are a common feature of Nordic temperate climates, and their timing and frequency can be influenced