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ALTA project has been active since 2016, providing, at LBT observatory site,forecasts of atmospheric parameters, such as temperature, wind speed anddirection, relative humidity and precipitable water vapor, and opticalturbulence parameters, such as seeing, wavefront coherence time and isoplanaticangle with the final goal to support nightly the science operation of the LBT.Besides to the forecasts, during the years ALTA has been collecting statisticson the atmospheric conditions which can be used to draw a very accuratecharacterization of the climatology of the telescope site located on top ofMount Graham, Arizona. Such characterization can be used both for theoptimization and calibration of the forecast model and as a reference for amodel validation. The climatology of these parameters is conceived to be afurther output of ALTA that will be upgraded on the website with time and itwill be able to put in evidence trends at short as well as long time scales. Inthis contribution we present a climatological description of all theatmospheric parameters relevant for ground-based astronomy in order to provideto the scientific community a robust reference of the bserving conditions atLBT. The study is performed using on-site measurements provided by DIMM andatmospheric sensors over several years and made available in the telescopetelemetry data.

Characterization of LBT atmospheric and turbulence conditions in the context of ALTA project