Weather here can be quite variable from day to day and even within a 24 hour period (like today, from below freezing to the low 50s), and depending on your activities.

Several thin layers under a thin shell is a practical approach. You can take things off, rearrange layers and never feel too hot, or too cold. Wear a hat. And don't forget that your legs, even under pants, comprise a large area of skin that cools you as a whole, so leggings/longjohns aren't out of the question, especially if you're outside for long periods.

And if you're coming from Chicago, our weather will probably seem balmy.