I think 7C is the normally mentioned performance cutoff point for summer/winter tires. Apparently some insurance policies actually specify times (November 1 to April 30 I heard someone mention was common here in Ontario).
My inclination would be to use summer tires unless your insurance specifies otherwise.
I tried that but from what I can tell you have to remember to do it every time because turning off the ignition (actually I think turning on the ignition) seems to put it down and reset to automatic mode. With lots of other stuff to remember that was at the bottom of my list.
Great video — I also spotted the grey/silver 987 Boxster around 11:40. Being a 987 owner myself I was particularly interested in the spoiler retracting in 5 and deploying again as you passed. Inside the car you never know if it is working!
I use outdoor masking tape( at least on the front edge of an 81/2 x11 magnetic sheet with numbers printed on and the corners of the sheet radiused). Seems to work well in the cold/wet. Last time out when temps were warm I didn’t use tape at all.
I suspect the electrical tape might leave sticky hard to clean residue but since I haven’t used it I don’t know for sure. The outdoor masking tape comes off cleanly.