Was kinda bored so I decided to wash my FK2 in 13°C weather with 10km/h wind.
Finished about 5 min ago and my fingers are frozen, my feet are frozen my shirt and pants are soaked cause the hose leaked but I think it was worth it.
Today is a very hot summers day where I live. When I was driving around today the temperature sensor said 15°C, and I'm wearing shorts and a t-shirt.
13°C is warm. The coldest I've cleaned my car outside was -2.5°C and I had to put the soap on parts of the car at a time and then rinse it off before it froze, but I was showing the car for sale and the garage was full so I had to clean it!