Heat index
The heat index is the apparent temperature on a hot, humid day: high humidity slows sweat evaporation, so it feels hotter than the thermometer reads. Thermograph folds it into the feels-like metric and grades how unusual it is locally.
How unusual is the weather? Graded against ~45 years of local climate history.
The heat index is the apparent temperature on a hot, humid day: high humidity slows sweat evaporation, so it feels hotter than the thermometer reads. Thermograph folds it into the feels-like metric and grades how unusual it is locally.