I was kidding about the apartment in Singapore, obviously, but I was living at 265m back in 2003-2004 when we were in Texas. In my pre-Morniverse days I lived at 188m in VIrginia and at about 280m in Ann Arbor Michigan. None of these surpasses Dujon. If I can go back to my childhood, though, I lived for a year at 946m, and INJ was at university at 1250m around the same time.
(I think there is a pretty good chance that INJ is also the person here who has been up the highest (while still staying on the ground) though I might be wrong about that.)
flerdle) It may well be Dujon, then, for current residence. My feet-on-the-ground record is El Teide in Tenerife, 3717 m or 12,196 ft. The air pressure there is about 64% of sea-level pressure and you noticed it. Quite a lot of puffing and blowing climbing the few hundred feet from the cable car to the summit. Water would boil at 88°C, just about enough to thicken gravy but not enough for a decent cuppa.
I lived for a year at about 420m on the Swiss/French border. It didn't feel at all high, because everything around was so much higher, namely the Jura mountains to the west, and the Alps etc to the south-east.
[Rosie] When I typed that about INJ I was vaguely thinking "we already had this conversation not so long ago", and your Tenerife posting reminds me that indeed we did.
(CdM) Probably my fault, then, because stuck on my bedroom wall is a b & w 1978 photo of me and half a dozen other herberts and several herbertesses, all from Croydon Astronomical Society, as we crowd round the summit marker. Where has INJ been? I think I've probably got the record for current UK residents. The modest height does make a difference in that snow, on the rare occasions that it falls, lasts much longer up here than in London and numerous occasions when there's light drizzle and mist whereas London is dry. Some of this is the London Heat-Island effect which on a warm calm summer night can be quite stark, with temperature differences of 8°C.