Dagsregn

Dagsregn is a term used in Scandinavian languages to describe rain that falls during daylight hours. It is not a distinct meteorological phenomenon, but a time-based description of precipitation. In meteorological reporting, precipitation is typically categorized by intensity and duration, and dagsregn would be reflected in the daytime portion of daily totals.

The most common mechanism behind dagsregn is daytime convection, where solar heating causes rising warm air and the formation of cumulus clouds that produce showers or rain in the afternoon or midday. In temperate regions, fronts or low-pressure systems can also bring rain that occurs during the day. In tropical climates, diurnal rainfall tends to peak in the afternoon or early evening due to convection.

Rainfall is measured in millimeters, and daily totals are often reported as a daily amount. Dagsregn may be noted when most of the rainfall for a day occurs during daylight hours. Rainfall varies in intensity from light to heavy, and dagsregn can range from brief showers to longer rain events.

Regional patterns vary: in northern Europe, dagsregn is common in spring and summer and aligns with convective showers, while tropical regions experience a more pronounced diurnal cycle with daytime rain as a regular feature. Impacts of dagsregn include reduced visibility, slippery roads, effects on agriculture and water management, and potential flood risk if rainfall is intense or prolonged.

See also: precipitation, convective rainfall, diurnal cycle.