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(We got a request for a Celsius version of this post and since we are a full service website we created one and put it here<\/a>).<\/p>\n So, we were wondering, what’s this heat index we hear about? We went to the Wikipedia article on it<\/a>. It is an index that combines air temperature and relative humidity to convert a (hot) temperature into something like perceived temperature, how hot it feels. It formalizes the adage “it’s not the heat, it’s the humidity.”<\/p>\n The equation to get heat index from temperature and relative humidity is big:<\/p>\n This heat index chart is also complicated, but it allows one to look up the heat index rather easily.<\/p>\n We wanted a better way to see what the heat index is doing. So we made this plot:<\/p>\n When it’s 90 degrees outside with 90% relative humidity, it feels 30 degrees hotter. That’s a lot of degrees.<\/p>\n It turns out there is another heat index formula. This one’s even more complicated.<\/p>\n We wanted to see how it compared to the first, so we plotted both together:<\/p>\n We like averaging, so we plotted the average of the two outputs:<\/p>\n We thought it looks not so far from linear so we fit a regression model to the average and plotted that:<\/p>\n Then we couldn’t resist coming up with a simple heuristic (shown in dots):<\/p>\n The heuristic comes pretty close to the regression model. <\/p>\n
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