The diurnal cycle refers to the daily pattern of change in various atmospheric and environmental variables over the course of a day. These changes typically occur in response to the rotation of the Earth and the corresponding variations in solar radiation and temperature. The diurnal cycle encompasses a wide range of phenomena, including temperature fluctuations, humidity levels, wind patterns, cloud cover, and precipitation. Understanding and studying the diurnal cycle is important for predicting weather patterns, assessing climate change impacts, and informing various fields such as agriculture, ecology, and public health.