Singularity (climate)

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A singularity is a weather phenomenon associated with a specific, potentially approximate, calendar date. For example, a large snowstorm that occurs around February 1 would be a singularity. Seasonal trends and their consequences (such as the fact that May Day is usually warmer than New Year's Day, in northern locales) do not comprise singularities; the British tradition that rain on St. Swithun's Day (15th July) will be followed by 40 days and nights of rain would if true represent a singularity, but is not supported by weather records.