Because I love charts and visualizations, I decided to plot out data from touringplans, this year vs last year. I have the predicted crowd, actual crowd and high temp (does not take into account heat index and any heat warnings). This is only for Magic Kingdom.
I took the few days prior and after the 4th. To be honest, I'm not sure how to interpret. It doesn't correlate 1:1 with the temp (though feel like temps and actual temps can be widely different). I'm sure there was some impact there like I have thought, but in general, it just looks like people might have skipped WDW that weekend? other than that, the actual crowd levels seem to be on par with last year, hovering around 5-6 crowd level. If anyone has a way of seeing historical excessive heat warnings, I'd be curious to see how that data overlays with the dip.
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I also expanded 2023 so that similar days of the week can be compared. The wednesday before the 4th was actually higher this year with a similar high temp.
All this to say, as I have been, I think the weather can have an impact ON TOP of all the other factors. I do not discount that Disney hotels do seem to have a lower occupancy rate than last year. Perhaps a higher percentage are staying off site for cost savings and that perks for staying on site are lower. So when you take that then add in higher than average temps and excessive heat warnings you get what we saw the 4th of July weekend.