Let me know what specific time period you are looking for and I can pull something down from this resource. Great at creating precipitation over time graphs, historical perspectives, etc. Boston and Worcester hubs likely have the most accurate data historically, yet as an example:
This summer (June-August) was our wettings summer since 1955
June thru current day in September is 5th wettest all time.
https://xmacis.rcc-acis.org/