Singularities are specific types of weather that occur fairly regularly at a specific time of the year. They are often warm or cold, wet or dry, conditions that are considered departures from the normal annual march of temperature and precipitation.
In the United State, the best-known singularities are the Indian Summer, the January Thaw, and April Showers. Clearly such features are not observed throughout all climate regions.
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Indian Summer
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Oliver, J.E. (2005). Singularities. In: Oliver, J.E. (eds) Encyclopedia of World Climatology. Encyclopedia of Earth Sciences Series. Springer, Dordrecht . https://doi.org/10.1007/1-4020-3266-8_186
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