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Mean on Earth during Snowball Earth [21] around 650 million years ago 224.8 K: −48.4 °C: −55.0 °F: Coldest temperature that water can remain a liquid (see supercooling) 225 K: −48 °C: −55 °F: Freezing/melting point of cottonseed oil [22] 233.15 K: −40 °C: −40 °F: Intersecting point of the Celsius and Fahrenheit temperature scales