Dews getting to about 62 will kick up the frizz for me, but I can get frizz pretty easily anyway due to wind here. Two things help me: one, using a lot of gel and a hard hold one; two, pixiecurl diffusing. I use KCCC + BRHG and quite a bit of it--enough to get a lot of crunch by the time it dries. Once I SOTC, I've never had an issue with the curls being too stiff or unnatural looking. I actually get compliments when it's still crunchy, which I think is a little odd because IMO it looks like poop, but OK. I also pixiecurl at least until I've got a good cast on, so 50-75% dry. If I do these two things, I'm pretty much frizz-free on day one and can keep frizz to a minimum on day two.
3a/b, F, normal porosity

Wash with either Suave Tropical Coconut, As I Am, or CJ Daily Fix
Condition with STC or Yes to Blueberries and detangle with Denman, rinse very lightly (baptismal rinse)
Add LAL gel, either Sport or Wet Look, scrunch with flour sack towel, and plop
Diffuse 5 minutes, then air dry