My cat thermometer on the porch has both °C and °F so I record the temperature in °C in my weather log. I'm consistent so I also record the rainfall or snowfall in mm. I also have my smartphone show °C and my husband does the same on his.
If someone asks a weather question on AM I'll give both to avoid any confusion.
We tried to convert to centigrade back in the mid '70's, along with converting to other "metric" measurements (centigrade really isn't "metric", just a different scale more widely used by "scientists" and in other parts of the world) but none of it seemed to "take" Stateside. It didn't "take", although I know some "finish" carpenters and cabinetmakers that use centimeter tapes and rules because of the easier to use finer step size.