Thank you for the information about dews!
I checked out the frizz forecast for the first time yesterday (I thought it would only work for US but I was very very surprised to see that it also works for my home location in Belgium) and found out that my dews are in the low 40s now, but with 80% humidity (it's still rather cold here, but we're probably going to have a really warm summer), does this mean I will probably have high dew points/high humidity when summer arrives?

And that I therefore "need to" stock up on other products to keep the frizz out? (I always had to battle with frizz... and for some odd reason my hair is always acting less frizzy when I'm not in on a holiday somewhere else... not sure if it has anything to do with humidity though, or if it's just coincidence)