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The heatindex package enables fast calculations of the heat index

  • 1979: Robert Steadman publishes his seminal paper introducing the calculation of the heat index with values given in his Table 2. Unfortunately, no values are calculated for extreme heat and humidity.

  • 2022: Yi-Chuan Lu and David Romps publish a paper that calculates the heat index for all combinations of temperature and humidity. Associated with this publication is the release of R and Python code for calculating the heat index.

  • 2025: Yi-Chuan Lu and David Romps release the heatindex package with the heatindex function, which calculates the heat index 10,000 times faster than the previously released R and Python code. This simpler and faster implementation of the heat index is based on a paper by Lu et al., currently in review; see Citation for details.