That's an incredible amount of rain for parts of CT and Long Island. Many of the cities and towns around me are having us design stormwater controls by the Cornell extreme precipitation charts, which are much higher than the ones we prreviously used. For example, my local 100 yr/24 hr storm used to be in the 6.4" range, and now it's in the 8.4" range: https://precip.eas.cornell.edu/#/