When the temperature is 30 ° C ( 86 ° F ) and the dew point is 15 ° C ( 59 ° F ) , the humidex is 34 ( note that humidex is a dimensionless number , but that the number indicates an approximate temperature in ° C ) .
When the temperature is 30 ° C ( 86 ° F ) and the dew point is 15 ° C ( 59 ° F ) , the humidex is 34 .