Meteorological sensors are located at the top of a 20 m tower, the NADP Tower, behind the main buildings of El Verde Field Station, 350 masl. No large trees are present near the tower. Sensors are connected to a Campbell 10X data logger, with a storage module, and downloaded every two weeks using a wireless radio connection from the laboratory to the tower. The data is compiled at the station and send to ITES once a month. The station was initiated in 1999. In a separate physical location, rainfall and maximum and minimum air temperatures are measured manually on a daily basis.