Question: How many years ago did the Last Glacial Maximum occur?
About the article "Climate change", section "Precipitation".

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The last glacial period was the most recent glacial period within the current ice age, occurring in the Pleistocene epoch, which began about 110,000 years ago and ended about 15,000 years ago.
The glaciations that occurred during this glacial period covered many areas of the Northern Hemisphere and have different names, depending on their geographic distributions: "Wisconsin" (in North America), "Devensian" (in Great Britain), "Midlandian" (in Ireland), "Würm" (in the Alps), "Weichsel" (in northern central Europe), and "Llanquihue" in Chile.
The glacial advance reached its maximum extent about 18,000 BP.
In Europe, the ice sheet reached northern Germany. 
The Last Glacial Maximum (LGM) refers to a period in the Earth's climate history when ice sheets were at their maximum extension, between 26,500 and 19,000–20,000 years ago, marking the peak of the last glacial period.
During this time, vast ice sheets covered much of North America, northern Europe and Asia.
These ice sheets profoundly impacted Earth's climate, causing drought, desertification, and a dramatic drop in sea levels.
It was followed by the Late Glacial Maximum. 
The Pleistocene epoch lasted from 2.6 million years ago until 12,000 years ago.
During this period there were a number of glacial and inter-glacial periods.
During the glacial periods there were large drops in sea level, so the coast-line was greatly modified.
The final major cold spell occurred from 25,000 to 18,000 years ago and is known as the Last Glacial Maximum when the Fenno-Scandinavian ice sheet covered much of northern Europe while the Alpine ice sheet occupied significant parts of central-southern Europe.
However there were several less cold periods after this.
The epoch ends with the Younger Dryas when there were small ice sheets in Scotland and Scandinavia. 
In the Sierra Nevada, there are three named stages of glacial maxima (sometimes incorrectly called ice ages) separated by warmer periods.
These glacial maxima are called, from oldest to youngest, "Tahoe", "Tenaya", and "Tioga".
The Tahoe reached its maximum extent perhaps about 70,000 years ago.
Little is known about the Tenaya.
The Tioga was the least severe and last of the Wisconsin Episode.
It began about 30,000 years ago, reached its greatest advance 21,000 years ago, and ended about 10,000 years ago. 
The last glacial period, popularly known as the Ice Age, was the most recent glacial period within the current ice age occurring during the last years of the Pleistocene, from approximately 110,000 to 12,000 years ago.
During this period, there were several changes between glacier advance and retreat.
The maximum extent of glaciation within this last glacial period was approximately 22,000 years ago.
While the general pattern of global cooling and glacier advance was similar, local differences in the development of glacier advance and retreat makes it difficult to compare the details from continent to continent (see picture of ice core data below for differences).
From the point of view of human archaeology, it falls in the Paleolithic and Mesolithic periods.