At the JRC-IET, commercial hydrogen tanks have been subjected to filling-emptying cycles to investigate their long-term mechanical and thermal behaviour and their safety performance. The local temperature history inside the tanks has been measured and compared with the temperatures outside and at the tank metallic bosses, which is the measurement location identified by some standards. The outcome of these activities is a set of experimental data which will be made publicly available as reference for safety studies and CFD validation. Comparison with the available RCS is also presented in this paper.