When do you think my temp shift was?

Allison
Hey everyone! Quick question because I'm driving myself crazy trying to figure this out. Based off my Kindara chart below, do you guys think my temp shift was CD 40 or later? It looks like it could be a fall back rise since it dips back down before going up again, but I'm not sure. Any opinions are appreciated!
You'll need to click on the pic to see the top where the CDs are :)