Time series of Maximum air temperature (12 h) observations from the Norwegian weather station Mandal (WIGOS ID 0-20000-0-01430, station ID 41090). Highest recorded air temperature per 12 hours. The observations have been through the data collection system of the Norwegian Meteorological institute which includes a number of automated and manual quality control routines. The number of available quality control routines is parameter dependent. Note that this is a live/dynamic dataset: New observations arrive (at a pace that depends on the station and parameter) and existing observations may be corrected (even some of the very old ones).