I can tell we’ve turned a corner with daylight too, as June/July we usually only decouple down to whatever the previous afternoon’s mixed out dew point was. If the dew bottomed out at 4pm at 58F, that’s usually what the low temp will be the next morning, 58F and foggy.
Now though, we are starting to get longer nights and this week we started beating the afternoon minimum dew by 3-5F. Like yesterday I think it was 53F and the min was 49F this morning and I think the past 3-4 nights have all gone a bit lower than our lowest afternoon dew reading.