Horses have a much wider thermoneutral zone then humans do. Research has shown this means a fit and healthy unclipped horse typically feels cold only when the weather creates temperatures below 0°C and they feel hot when it reaches 25°C. Humans have a much narrower thermoneutral zone of between 25 and 30°C. So when we think it’s cold outside, horses still feel quite comfortable. Here are temperature guidelines for when a horse is likely to need a rug/blanket, which can be used as a starting point for your decision making.