Check whether it's safe to exercise your horse based on temperature and humidity.
Based on the AAEP / US Equestrian equine heat index guideline (temperature + humidity). This scale is specific to horses and differs from the National Weather Service human heat index. It's a general guide, not a substitute for watching your individual horse for signs of heat stress — some horses (heavier coats, PPID, poor fitness) overheat faster than others.