You can always put more on, but there's a hard limit to what you can take off.

Hence the picture. Above 70 F is where it begins to get uncomfortable. Then it gets much higher than that as well

Assuming you are talking in Fahrenheit you don't really need a jacket for everything above 35° as long as it doesn't rain or is particularly windy. 100° just make me feel as if I am getting cooked alive with nowhere to escape