The highest temp I ever remember in June for here is 98, even in late June and with a WNW flow. It's very hard to hit 100 here in June. But it does prime the ground for what can happen in July, as a lot of those years where we hit upper 90s in June we topped 100 in July.....
If you look up JFK 100 degree summers, more often than not it was 95+ June 20-30 .....
It becomes very difficult to hit 100 again in August, because always seems to be much more humid than July. I think the last time JFK hit 100 in August was 1983, though not sure about that? Upper 90s almost seem to be as likely in early September as they are in August. 98 seems to be our peak here in any summer month outside of July (and I consider September to be a summer month now.)