WBGT and Heat Index

  • The WBGT is not quite the same as heat index.
  • The WBGT is taken in the Sun to account for the intensity and angle of the Sun’s energy striking the Earth.
  • It also uses wind measurements to get a more accurate picture of how people respond to hot weather conditions.

Comparison with Heat Index

  WBGT Heat Index
Measured in the Sun Y N
Measured in the Shade N Y
Uses Temperature Y Y
Uses RH Y Y
Uses Wind Y N
Uses Cloud Cover Y N
Uses Sun Angle Y N

Source: www.srh.noaa.gov/tsa/