We don't know what hot weather is. I know we think we do.

But isn't humidity the all important factor? 46C with only 8% humidity
surely cannot feel as bad as 38C with 70% RH (which is regularly experienced
in India pre-monsoon)?.

I have seen 41C with 68% RH, now that must have felt warm.

Air with low humidity contains much less energy than air with high humidity;
am I right? Therefore heats up quicker (as in desert regions).
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Nick G
Exe Valley, Devon
50 m amsl