Scott- After kneading, your dough will feel tacky, but not overly sticky. Eventually, you will know exactly how it should feel, by trial and error. It is better to have the dough with a little less flour than too much, especially if whole wheat. And yes, humidity plays a big factor. More moisture, more flour. And another hint, after first rising, when you are forming your loaf, oil the surface rather than flouring it. I know most people tell you to flour, but think you will be happier doing it the other way.