Hard to say without knowing what your interests are. Do you have to go to Worcester anyway and are deciding if you're staying longer? If so, there's definitely stuff to do. Coming here in Winter just because? There might be better places to go within 80 minutes this time of year.

The Worcester Art Museum is quite nice.

If you have kids, EcoTarium is great; my son and I go there a lot.

Tower Hill Botanic Garden is nice, but you'll be missing most of it in Winter.