In reality there are probably kind of two answers to this. The physics (as outline in the article referenced above) makes it clear that 'Yes, if affects wireless signal'. The other side to it would be 'Does it affect my wireless signal enough to cause me a problem in practise?' - and that's a whole different question, because a wireless environment is affected by a huge host of other factors. If your environment is 'close to the edge' so-to-speak, from one or more other factors, it's possible that changes in heat/humidity could tip it over. Bear in mind too, it looks like the testing referred to above is for frequencies only up to 2.4 GHz, which has overuse problems all of its own, generally - 5 (& increasingly 6) GHz would be more affected, given the much higher frequency. If your office does suffer with high humidity, in particular, I think you'd just take more care to try to minimise the deleterious effects of the other factors. You might also look closer at your air conditioning system; it sounds like your employees might thank you for that, way before the WiFi is affected MT15 anyone? 😀
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