TagNachtTemper

TagNachtTemper is a term used in meteorology and horticulture to denote the diurnal temperature range of a location, defined as the difference between the daily maximum and minimum temperatures within a 24-hour period. The concept mirrors the English term diurnal temperature range and is formed from the German elements Tag (day), Nacht (night), and Temper (temperature). In practice, TagNachtTemper quantifies the extent of thermal variation over a typical day and is influenced by factors such as solar radiation, humidity, cloud cover, wind, and surface characteristics.

Typically, TagNachtTemper is computed from official daily maximum and minimum temperatures reported by meteorological stations, with the day defined by the local calendar date or a fixed 24-hour window. Some references use a daytime period from sunrise to sunset; others rely on calendar days. The value can vary seasonally and geographically, with arid regions often showing larger ranges than maritime or humid areas.

A larger TagNachtTemper indicates more pronounced heating and cooling during a 24-hour cycle, affecting frost risk, plant growth, and energy demand. In agriculture, crops may require different acclimation strategies depending on the diurnal range; in building design and energy planning, high diurnal ranges can drive peak cooling or heating loads and influence insulation and ventilation considerations.

See also: diurnal temperature range, diurnal temperature variation, weather station data.