Tree rings: summer 1453 was the coldest in Europe for decades
European summer temperature reconstruction: 1453 is 2.6 standard units below the 1430 to 1480 mean, colder than any summer after Kuwae (1459: 1.4 below). Summer 1452 was normal (0.5 above). So the eruption came after the summer of 1452 and before the summer of 1453.
How it connects
This clue from nature supports this hunch
Daily Korean records can date the 1452/53 eruption to the month sets the window: after summer 1452, before summer 1453
This clue from nature is a clue for
The mystery eruption of 1452/53 and the omens at the fall of Constantinople
This clue from nature we read it in
European summer temperature reconstruction (EuroMed2k, Luterbacher et al. 2016), NOAA Paleoclimatology