The Global Lake Ecological Observatory Network (GLEON) Vega database/tool provides access to sensor records from GLEON lakes. Variables includes e.g. (varies among lakes) Ablation, Radiation, Temperature, Photosynthetically Active Radiation, Precipitation, Humidity, Soil temperature, Wind direction and speed, Disolved oxygen, Transmittance, Chlorophyll. Data can be viewed and downloaded using a Java-tool or using a web interface, see instructions at http://www.gleon.org/Data.php .
More information on this dataset can be found in the Freshwater Metadatabase - BFE_62 (http://www.freshwatermetadata.eu/metadb/bf_mdb_view.php?entryID=BFE_62).