There is no universally accepted definition of a hot spring. For
example, one can find the words "hot springs" defined as: * any
geothermal spring * a spring with water temperatures above its
surroundings * a natural spring with water temperature above
body temperature – normally between 36.5 °C (97.7 °F) and 37.5
°C (99.5 °F) * a natural spring with warm water above body
temperature * a thermal spring with water warmer than 36.7 °C
(98.1 °F) * a natural spring of water greater than 21.1 °C (70.0
°F) (synonymous with thermal spring) * a natural discharge of
groundwater with elevated temperatures * a type of thermal
spring in which hot water is brought to the surface. The water
temperature of a hot spring is usually 6.5 °C (11.7 °F) or more
above mean air temperature. Note that by this definition,
"thermal spring" is not synonymous with the term "hot spring". *
a spring whose hot water is brought to the surface (synonymous
with a thermal spring). The water temperature of the spring is
usually 8.3 °C (14.9 °F)