Global solar radiation began in July 1960. Radiation is sensed by an Eppley Pyrheliometer and recorded on a Campbell data logger. Some evaporation measurements at CS01 have been made using National Weather Service class A type pans. However, data reported here are derived from a buried pan 36 inches in diameter and 18 inches deep, providing a more representative climatic norm for evaporation. Air temperature and recorded precipitation are continuous measurements.
Solar radiation is sampled every minute.
Standard rain gages are sampled either daily or weekly. The evaporation pan is sampled daily. After resetting, maximum and minimum thermometers are compared to the standard thermometer daily. Two solar radiometers are returned for recalibration on alternate years. Temperature observations are read to 0.5 F. Precipitation is read to the nearest 0.01 inch.