This type of day can happen any time of the year... just most commonly in mid to late fall. We had temps in the 50s and all day on July 3rd just 2 years ago.
Here is another Novemberish looking thing...
I think it’d be wise to set up a forum rules committee for out of season comparisons and/or “taste of (insert season of choice based on tangible weather conditions) today” comments of those of the like.
Personally I’d go with late October to EXTREMELY EARLY November based on a 34 point system of analysis first developed by Chris Durkin.