A 1 Temperature | C Humidity | F Heat Index | ||
2 81 | 82 | 86.82 | ||
This is an Excel spreadsheet program. Fairly simple. Just enter the temperature and humidity as seen above.
However, the formula behind the Heat Index is a bit more complex. I will show you the formula for the Heat Index that is in cell F2.
=-42.379+2.04901523*A2+10.14333127*C2-0.22475541*A2*C2-6.83783*10^-3*A2^2-5.481717*10^-2*C2^2+1.22874*10^-3*A2^2*C2+8.5282*10^-4*A2*C2^2-1.99*10^-6*A2^2*C2^2
I shared the dewpoint calculation last week. The above formula for the Heat Index is fairly accurate. It has an error of +/- 1.3 degrees. Nevertheless, I use it for a close approximation for my purposes.
I hope to share additional formulas for you in the near future like Wind Chill index and distances between locations using coordinates. The latter I like to use for my StormChase database since storms typically don't follow any roadmap. I use it more for an intercept application combining road maps and coordinate distances.
MS
This is so helpful! Thank you for your kindness and generosity to share the formula. I am currently doing an analysis of daily and average heat index for the June-August months here in sunny SC and will use your formula. (Link to your site of course). Thanks once again!
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