Although in the northern hemisphere this tends to be best around May-August, it can occur at any time of the year bringing huge ranges on the VHF bands. There tends to be a smaller peak around December-January.
Southgate News has a link to a piece on Es. In my view, despite having experience of Es since (at least) the 1930s, the world still has much to learn about it.
See https://www.electronics-notes.com/articles/antennas-propagation/ionospheric/sporadic-e-es.php
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