Hopefully, you will get more opinions ....
I'm in NM where it keeps pretty warm. My fan seldom comes on. Mostly if I am in the garage tuning it.
After 12 years, I am sure that it has never come on in 40-50 degree weather. How long are your stop lights?

I would suggest that it is running too lean at idle. Maybe partially clogged slow jets or idle screw passages.
BlueValk