“faster runners, who generate more heat, benefited from cooler temps, with the top one percent (green line below) peaking at 38.9°F. Midpackers (red line) do best in the mid-40s.”

full article, and some science and charts, here.

I agree. I love 37 to 47 as a range based on the distance. If there’s a chilly wind, we’ll just add a layer, trust me, you’ll be FINE. And you’ll run FASTER

1- because you don’t get as tired when it’s cold(er) than when it’s hot(ter).

2- to warm up

and who knows, maybe the wind will be on your back! Ummmm, hot chocolate afterwards! Of course after that macintosh apple we get at the finish, the most delicious treat I look forward to for 365 days!

Also, it’s only Tuesday, it can change so MUCH from here to Sunday. Don’t think about it until Saturday!