Diurnal Temperature Variation

Diurnal temperature variation (DTV) refers to the daily fluctuation between daytime highs and nighttime lows in a cultivation environment. Cannabis plants respond to these temperature cycles, which influence photosynthesis rates, metabolic processes, and cannabinoid/terpene expression. Natural outdoor environments typically show greater DTV than indoor rooms, affecting how plants regulate growth patterns and secondary metabolite production. Breeders and cultivators track DTV as an environmental factor that interacts with photoperiod, humidity, and light spectrum to shape phenotypic expression. Understanding DTV is important for replicating strain characteristics across different growing conditions and predicting how genetic lines may perform under varying climate regimes.

Breeders working in controlled environments document how their lines respond to specific DTV ranges, since temperature swing magnitude can influence internode spacing, flowering timing, and aromatic compound ratios. Seed companies often note whether a cultivar is suited to high or low temperature variation, helping growers match genetics to their local climate or controlled-environment setup.