Managed to get WU History and WU Reports working (in Menu), which prompted me to try WU Graphs for previous years. With help (thanks, Wim!) I even managed to do that. . . pop-ups labelled “Choose”.
Also realised that I could use the comprehensive WU forecast in the small advisory block even though I use Dark Sky for the main forecast block. . . and that I could add the WU forecast pop-ups as well (under Current Conditions block) 