Even under the narrowest definition, there's been at least 1 mass shooting every month this year

Updated 11:03 AM ET, Thu June 15, 2017

Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

(CNN)There's no one commonly accepted definition of a mass shooting. But whatever criteria you use, the conclusion's the same: They are far too common.

If you go with the narrowest definition ...

The government has never defined "mass shooting" as a standalone category. Let's go with the most commonly accepted definition, from the Congressional Research Service: a shooting in which a gunman ...
  • kills four or more people
  • indiscriminately
  • in a public place
That definition rules out the Congressional baseball practice shooting or the incident at the UPS facility this week because neither gunman killed four people. In last week's Orlando shooting spree, the gunman killed five people -- but that attack doesn't count either because police say he targeted his victims.
Using that narrow definition, from January 1 to June 14, we have seen 8 deadly mass shootings.
That's an average of 1.3 mass shootings a month.

If you go with the raw numbers ...

What if you didn't rule out motive and just considered the casualty count? According to the non-profit Gun Violence Archive, which compiles data from shooting incidents, a "mass shooting" is any incident where four or more people are wounded or killed.
By that definition, from January 1 to June 14, we have seen 154 mass shootings.
That averages to 6.7 mass shootings a week.