This paper describes a data processing system for recording automatically on paper punch tape and a teletypewriter 29 different meteorological variables measured at the Argonne National Laboratory. The meteorological sensors are coupled to the data system either directly or through analog-to-digital converters attached to the recorders. Average values of the meteorological variables over periods of 2, 10, or 60 min are obtained by modified ball and disc integrators and pulse accumulators. Other characteristics of the data processing system and an enumeration of difficulties encountered and their solutions are discussed.