Sure it was.
100 degrees has nothing to do if its a hot summer. 100 degree reading tells you how dry the air was. Even tropical areas dont hit 100 because it takes an incredible amount of energy to heat humid air to 100 degrees, and it usually rains.
And i do believe LGA and EWR hit 100 recently. Either way, 100 degrees happens when you have a dry westerly flow. Lately we have had the SE ridge and bermuda high kicking up a more SW flow, so we bake mid 90s with dews over 75. Again, hitting 100 has no bearing at all on how "hot" a summer is. 100/60 feels much cooler than 91/77.