I think this is a really hard problem to solve. E.g., today's projected high in Bangkok, which I found to be unpleasantly warm in March, is the same as today's high in Utrecht, because we're on the tail end of a heat dome. Nobody here uses AC. It's been a delight. What I think is more important to consider is whether the local infrastructure can handle extreme temperatures if they are likely. This too is hard to predict, but probably less hard. It sounds like Madrid may have the infrastructure needed to deal with normal hot temperatures. But Spain did have a massive blackout earlier this year. If that happens on a day when there's a high of 37C, will people with health vulnerabilities be okay? Bangkok suffered a scary earthquake a few weeks after we were there. How would we have fared if it had happened /during/ IETF? Personally I'd rather we avoided destinations that are likely to have heat issues, but will that exclude participation by people who would otherwise get to go? Anway, I just don't even know how we'd reach a consensus position on how to handle this, so I think we need to rely on individual judgment here. E.g., Tim is skipping Madrid. There are lots of things that can cause people to self-select to not attend. This is just another of them.
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