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Summer scorchers can be exhausting: early mornings, humid air, and long, hot days. Is there such a thing as "too hot"? And what exactly is "too hot"?

Temperature is not the only thing that matters, as humidity is another important factor. If the combination of these two exceeds a certain value, the horse's ability to cool themselves is affected. This chart based on data provided by researchers at the University of 
Minnesota is a tool to help you decide whether it is okay for your horse to work or if you should let them rest in their stable for the day. 

The basic value of this chart is the sum of air temperature (°F) and relative humidity (%). Here is the conversion equation between Celsius (°C) and Fahrenheit (°F):

°C to °F: Multiply by 1.8, then add 32 (let’s assume it’s 30°C – 30x1.8=65, 54+32=86°F).

If the sum of air temperature and relative humidity is less than 130, your horse can cool themselves well and it is an ideal day for them to exercise. The ability to cool the body is decreased over 130. While climbing over 150, it is greatly reduced. When the combination is more than 180, the conditions may become fatal to your horse if stressed. In these conditions, it is per your careful consideration if the exercise is really necessary.