Es season ending?

Although in the past I have worked 6m Es with QRP SSB way into September, we are reaching the point now when Es openings start be become less frequent. FT8 may be transformative and it is worth using FT8 to probe for those elusive openings. Nonetheless, it is probable that Es openings will become less frequent in the northern hemisphere. For reasons I don't know there is a smaller peak near Christmas.