It really depends on where you live. I can use humectants right now because our dews are 30-50 range but I don't keep humectant stuff around because the dews are normally so low. This thread may help some. Dew point and hair types
Oh and http://www.wunderground.com has forecasted dews if that helps you.
Southern Colorado Curly
Mix of 2s med-low porosity, med-fine texture, lots of hair