Fermentation temp plays a huge role in the ester profile (and the bouquet resulting from complex interactions between alcohols, acids, and esters during aging). It is very strain dependant; as an example D47 can be used safely between 64F and 68F, it can produce very cool flavors at 68-72F but it takes a long time for the fusels to mellow at these higher (relatively) temps, whereas D21 if fine up to 76F and can get a bit "hot" at 76-82F, but still be great after aging, and D10 can work at 55-74F with little difference in ester profile (just a difference in aromas being blown off).
As for lees aging, temp increases the effect slightly, so I get equivalent sur lie character in 7mos at ~7XF that I can get in 9mos at say 60F (somewhere around there).
As for plain aging, anything less than 100F is fine! I'm serious. Me and medsen age our meads at ambient down here in south florida anywhere from 72-82F (on my side), with no (or little) ill effects. I will say maderization works magic on meads, though you'll have to ask Medsen about the specifics he uses (it works very well) or look on some of the wine forums.
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