The Black Growler Steam Vent in Yellowstone National Park has been clocked at 199-280 degrees F.
A lot of natural steam vents, namely in Hawaiim are used as natural saunas. The average temperature of a man-made sauna is 150-194 degrees F, and natural steam vents cane be around or slightly higher than this.
Hydrothermal steam vents are among the hottest in the world. Hydrothermal vents can reach temperatures of 752F.
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