chionogenesis
n.The ability to conjure snowfall by the mere mention of the word "Snow".
From Ancient Greek χιών (khiṓn, “snow”) + γένεσις (génesis, “origin, creation”), via Latin. The simplex genesis as a common noun (as opposed to Genesis, the name of the biblical book) dates from the late 16th century; as an English suffix, from the mid-17th century (attested in epigenesis and palingenesis). Influenced by French -génésie and German -genese, and productive in scientific vocabulary from the 19th century.
History
The first historical mention of chionogenesis can be found in Brown, Edward (1673), A Brief Account of Some Travels in Hungaria, Servia, Bulgaria, Macedonia, although Brown doesn’t mention it by name.
The opposite phenomenon, chionolysis, has been described theoretically, but so far has not been observed.
Example Usage
A: “Dammit, it’s cold today”
T: “Yup. At least it’s not snowing”
A: “No! Don’t mention…”
[Blizzard ensues]
A: “Chionogenesis.”
T: “Oh.”