This document provides background information for a large number of Zenodo Archives (section 2) associated with observations and modelling of urban land surface temperatures, predominately in London (UK). Details of Optris sensors used in London are provided at: · Grimmond, S., Benjamin, K., Gabey, A., Kotthaus, S., Morrison, W., Offerle, B., Pauscher, L., Ward, H., zum Berge, K., Brown, J., Crawford, B., Saunders, B., Sun, T., & Warren, E. (2022). Multi-city Urban Hydroclimate Data (MUHD) - Meta data for observations Release 2022-03-21. Zenodo. https://doi.org/10.5281/zenodo.13134582 The data have been used in a number of papers (section 4). The work was made possible by a number of grants (Section 3). These are gratefully acknowledged. A wide range of people have contributed to this work. They are (hopefully) all identified in individual papers (section 4) and the Grimmond et al. (2022) report. 1.1. Access to these files prior to embargo date If you would like access to these files prior to the embargo date please contact Dr William Morrison and/or Prof Sue Grimmond either directly or via urbisphere_ur@gmail.com Please cite the individual Zenodo Archives (section 2) and the publications (section 4).