Is 78 degrees hot or cold?

Terms like 'hot' and 'cold' must always be compared to something. Compared to our bodies, whose normal temperature is about 36, 78 degrees C is very hot. If the ambient temperature were 78 we should soon die. However, compared to boiling water, 100 degrees C, it's considerably cooler, and would have a significant effect on cooking times compared to boiling. 78 degrees C is 172.4 degrees F.