Original fish-eye camera images from an upward looking cloud camera at the urban rooftop weather station Freiburg-Chemiehochhaus (FRCHEM, 7.8486ºE, 48.0011ºN, 323.5 m) from the year 2020. Images have been recorded every 10 minutes, day and night, using a CC5MPXFE camera with 2592 × 1984 pixels (Campbell Scientific Inc., Logan UT, USA) installed at roof level with a hemispheric lens view. Files are sorted in packages per month, so e.g. 2020-01.tar.gz contains all images from January 2020. Images have been recorded every 10 minutes and are named according to the following scheme: UNIFR_YYYY_MM_DD_HH_II_SS.jpg where Y = year, M = month, d = day of month, h = hour of day (00-24), i = minutes (00-59), and s = seconds (00 - 59). All times are given in UTC. Seconds may slighlty vary depending on internal clock. The camera has been alinged so the top of the image points to geographic North (N), left is West (W), right is East (E) and bottom is South (S). The image "sky_camera_mask.svg" provides an overlay with cardinal directions indicated. For orientation, the image shows the top of the weather station mast with the red light and anemometer to the W and a lightning protection rod to the ESE. Images can contain dust, snow and raid droplets on the hemispherical housing. Due to a technical issue, selected images under high sunlight conditions are recorded in black.

COPYRIGHT Creative Commons Attribution 4.0 International. Copyright Albert-Ludwigs-Universität Freiburg, Professur für Umweltmeteorologie, Werthmannstrasse 10, Freiburg, Germany. CREATOR This work is owned by the University of Freiburg. ATTRIBUTION The [creation and] curation of this work has been supported by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No 855005) and the University of Freiburg. DISCLAIMER The use of the work is at the user's own risk. The authors, the University of Freiburg, and/or the European Research Council accept no liability for material or non-material damage arising from the use or non-use or from the use of incorrect or incomplete information in this work. The authors, the University of Freiburg and/or the European Research Council are not responsible for any use that may be made of the information in this work. The legal provisions remain unaffected.