Lowest Temperature Each Year for Places in United States

I found this site, while trying to determine if my perception of ever-warming winters (here) was accurate.

Short answer, yes. https://www.currentresults.com/Yearly-Weather/USA/FL/Tampa/e...

(backstory) I recall getting a doz instances of freezing each winter. Lately, winters seem to bring fewer freezing nights if any. Yard ghosts (covered warm-weather plants) have gone from common to uncommon. Some recently winters felt really warm to me.

Apparently, I'm not imagining it.