Boston has about 60 murders per year. 56% of murders in Massachusetts involve a firearm. Therefore, Boston sees about three murders involving a firearm per mo

Boston has about 60 murders per year. 56% of murders in Massachusetts involve a firearm. Therefore, Boston sees about three murders involving a firearm per month on average. This does not, of course, include justifiable homicides. ETA: So as not to scare anyone remember that in major cities typically between 65% and 91% of murder victims are criminals, and most of the killings are gang related.