The phenomenon during the fourteenth century is a little ice age.
What is a phenomenon called a little ice age?
The Little Ice Age (LIA), a climatic interval that occurred from the early 14th century to the mid-19th century, during which mountain glaciers extended to several locations, including the European Alps, New Zealand, Alaska, and the Southern Andes, with an average annual temperature of 1000 AD in the northern hemisphere 0.6 °C (1.1 °F) lower than the average temperature from 2000 to 2000. The term "Little Ice Age" was introduced into the scientific literature in 1939 by the Dutch-born American geologist F. E. Mathes.
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