Here's the answer I got from AI when I plug in the -1.9F others reported:
"Boston's January 2026 weather was 1.9°F below normal, with a monthly mean temperature of 29.4°F compared to the typical average of 29.9°F. The coldest temperatures occurred mid-to-late January, with lows dropping to -13°F on January 26 and -18°F on January 21. Despite the cold, snowfall was moderate, with 10 snowy days recorded, and total precipitation at 1.76 inches, which is 52% of the normal January rainfall. The month began with milder conditions, peaking at 53°F on January 15, but rapidly cooled as the month progressed."
They show a mean of 29.4F and an average of 29.9F, a difference of -0.5, hardly -1.9. And Boston certainly didn't get to -13F and -18F during the month.
If this is how AI is going to work, I'll never use it again.