This data set contains meteorological measurement data collected during the Field Experiment on Sub-mesoscale Spatio-Temporal variability at Hamburg (FESST@HH) between June and August 2020. The observational set up of FESST@HH consisted of a ground-based network of 103 autonomous measurement stations, that covered the greater area (50 km x 35 km) of Hamburg (Germany; 53.5 °N 10.0 °E) with the primary goal to observe the spatial dimension of convective cold pools. During the experiment 82 low-cost and self-designed APOLLO (Autonomous cold POoL LOgger) stations sampled air temperature and pressure at 1-s resolution, while 21 WXT weather stations with commercial sensors provided additional information on relative humidity, wind speed and precipitation at 10-s resolution. All variables are sampled at a height of 3 m above ground, if not indicated otherwise.

This research was carried out in the Hans Ertel Center for Weather Research (HErZ). This German research network of universities, research institutions, and the German Weather Service (DWD) is funded by the BMVI (Federal Ministry of Transport and Digital Infrastructure).