Observed relationship between nighttime cloud cover and ground meteorological parameters

摘要

Nighttime cloud cover (CC) is measured using a digital camera that records visible/ near-infrared images of the sky every 5 min. From June to December 2017，cloud signals are detected by implementing a threshold algorithm on the pixel values of the grayscale image. Ground temperature, relative humidity, and other meteorological parameters are recorded using a weather monitor. The comparison between the average CC and temperature values indicates that the increase of CC tends to increase ground temperature.