Is Boston hilly for biking?

I am an avid bike commuter and moving to Boston in the fall. I currently have a single speed and want to know how hilly Boston is.

The last few years I have spent in Chicago which is mostly flat.

Depending on hilly Boston is, I can keep my single speed as is or fit it with a 3,5, or 8 speed internal hub (Sturmey Archer).

Is Boston hilly and if so how many gears/ what kind of gear ration do I need.